Help me do the comma

[Ben Davis]

I put them such that the text subjectively has a nice flow to it and, more importantly, that logically distinct parts are separated and there are no ambiguities in meaning.

Hi OP,

Above is an example of when a comma is optional: following a conjunction (in this case, "and,"), there's no necessity for a comma however many people add one when they want to emphasise the subsequent 'subordinate clause' (the bit in between the commas). This is a use of The Oxford Comma, named after the Oxford University Press, which was used in two ways:

1. before the word 'and' at the end of a list
2. after a conjunction, for emphasis (to make it read like you would vocalise emphasis)

Hope that's clear.