Question:

Which version of the following portion of sentence 1 provides the most clarity? "...is by Richard Louv and who says that in the last 30 years kids have become increasingly removed..."

A is by Richard Louv, who says that in the last 30 years kids have become increasingly removed

Explaination

The part of the sentence "who says that..." is a parenthetical phrase about Richard Louv, not about the subject of the sentence. The "and who" is therefore incorrect, and the phrase needs to be set off from the sentence by a comma.