You can't generally make two grammatically-correct English sentences by starting with one and swapping a comma for a full stop, and if you can find a case where you can, it probably doesn't preserve meaning, even in the approximate (losing distinctions of how tightly coupled ideas are) sense you can with a semicolon rather than a comma.
But, generally, yes there is considerable evidence that shorter, simpler sentences (even if the total work is similar length) are easier to read, at the expense of reducing the space of ideas that can be clearly expressed.
It also seems like that style of writing in particular probably doesn't help reading comprehension, even though shorter sentence in general do.