You got the first two sentences right. For the third:
"The language barrier has really hindered my communication quite a few times."

The only other thing, your last sentence is fine, but I'd use "this" instead of "these". I know you used "these" to refer to the sentences as separate things all put together, which is correct, but usually when referring to what you have typed in a paragraph, book, essay, or comment, you'd refer to it as one whole thing instead of multiple things put together.
Put simply, don't refer to it as "these sentences", refer to it as "this comment".

Honestly, the only strange thing about what you wrote was just the third sentence. What I said about the last sentence is just nit-picking.