Looks good to me. :)

Thank you

I'm a professional editor for a major publisher and I wouldn't change one thing. Great work! There's no reason why this sentence shouldn't start with "be that as it may" - we have no idea what precedes this sentence and that's a perfectly valid phrase.

Yes, it does make sense. It's incredibly well written. :) You could, however, break it down into several sentences or change some of the words to make it easier. This sentence seems to require rereading to fully understand, because it's a bit convoluted. For example, you could say "even so" or "nevertheless" instead of "be that as it may". You could also say "think of" instead of "conceive of". You could also break that sentence into two, like so: "Nonetheless, humans experience the passage of time in the form of a sequence of events. This is essential to how they see the world and interact with it." I hope this helps. :)