Original sentence: One of Leon's most effective works was his attack on the Kabbala (Ari Nohem, first published in 1840), for in it he attempted to demonstrate that the "Bible of the Kabbalists" (the Zohar) was a modern composition
Edited sentence: One of Leon's most effective works was his attack on the Kabbala (Ari Nohem, first published in 1840), for in it he demonstrated that the "Bible of the Kabbalists" (the Zohar) was a modern composition