Complex sentence: In this way, he transformed Feuerbach's attack on religion from a mainly philosophical critique into a call to action and therefore held that atheism was the philosophical foundation stone of his ideology, but in itself was insufficient in solving society's ills.
Split into simpler sentences: In this way he transformed Feuerbach's attack on religion from a mainly philosophical critique into a call to action. He therefore held that atheism was the philosophical foundation stone of his ideology, but in itself was insufficient in solving society's ills.