A colon cannot separate sentences

EIPS/eip-211.md

@@ -13,7 +13,7 @@
 
 ## Simple Summary
 
-A mechanism to allow returning arbitrary-length data inside the EVM has been requested for quite a while now. Existing proposals always had very intricate problems associated with charging gas. This proposal solves the same problem while at the same time, it has a very simple gas charging mechanism and requires minimal changes to the call opcodes. Its workings are very similar to the way calldata is handled already: After a call, return data is kept inside a virtual buffer from which the caller can copy it (or parts thereof) into memory. At the next call, the buffer is overwritten. This mechanism is 100% backwards compatible.
+A mechanism to allow returning arbitrary-length data inside the EVM has been requested for quite a while now. Existing proposals always had very intricate problems associated with charging gas. This proposal solves the same problem while at the same time, it has a very simple gas charging mechanism and requires minimal changes to the call opcodes. Its workings are very similar to the way calldata is handled already; after a call, return data is kept inside a virtual buffer from which the caller can copy it (or parts thereof) into memory. At the next call, the buffer is overwritten. This mechanism is 100% backwards compatible.
 
 ## Abstract
 
@@ -21,7 +21,7 @@ Please see summary.
 
 ## Motivation
 
-In some situations, it is vital for a function to be able to return data whose length cannot be anticipated before the call. In principle, this can be solved without alterations to the EVM, for example by splitting the call into two calls where the first is used to compute only the size. All of these mechanisms, though, are very expensive in at least some situations. A very useful example of such a worst-case situation is a generic forwarding contract: A contract that takes call data, potentially makes some checks and then forwards it as is to another contract. The return data should of course be transferred in a similar way to the original caller. Since the contract is generic and does not know about the contract it calls, there is no way to determine the size of the output without adapting the called contract accordingly or trying a logarithmic number of calls.
+In some situations, it is vital for a function to be able to return data whose length cannot be anticipated before the call. In principle, this can be solved without alterations to the EVM, for example by splitting the call into two calls where the first is used to compute only the size. All of these mechanisms, though, are very expensive in at least some situations. A very useful example of such a worst-case situation is a generic forwarding contract; a contract that takes call data, potentially makes some checks and then forwards it as is to another contract. The return data should of course be transferred in a similar way to the original caller. Since the contract is generic and does not know about the contract it calls, there is no way to determine the size of the output without adapting the called contract accordingly or trying a logarithmic number of calls.
 
 Compiler implementors are advised to reserve a zero-length area for return data if the size of the return data is unknown before the call and then use `RETURNDATACOPY` in conjunction with `RETURNDATASIZE` to actually retrieve the data.
 
@@ -50,7 +50,7 @@ Other solutions that would allow returning dynamic data were considered, but the
 
 Note that the EVM implementation needs to keep the return data until the next call or the return from the current call. Since this resource was already paid for as part of the memory of the callee, it should not be a problem. Implementations may either choose to keep the full memory of the callee alive until the next call or copy only the return data to a special memory area.
 
-Keeping the memory of the callee until the next call-like opcode does not increase the peak memory usage in the following sense: Any memory allocation in the caller's frame that happens after the return from the call can be moved before the call without a change in gas costs, but will add this allocation to the peak allocation.
+Keeping the memory of the callee until the next call-like opcode does not increase the peak memory usage in the following sense; any memory allocation in the caller's frame that happens after the return from the call can be moved before the call without a change in gas costs, but will add this allocation to the peak allocation.
 
 The number values of the opcodes were allocated in the same nibble block that also contains `CALLDATASIZE` and `CALLDATACOPY`.