Complex sentence: In general, Timon's verses satirized the philosophies of other philosophers, and not the philosophers themselves (although there was some personalized satire), and the form was popular enough that five books were attributed (and three extant and confirmed) to Timon.
Split into simpler sentences: In general, although there was some personalized satire, Timon's verses mainly satirized the philosophies of other philosophers, and not the philosophers themselves. The form was popular enough that five books were attributed (three of which are extant and confirmed) to Timon.