Complex sentence: In the same year he was involved in the big fraud affair concerning the Berlin art dealer Otto Wacker, as De la Faille had wrote certificates of authenticity for 30 paintings which turned out to be fakes.
Split into simpler sentences: In the same year he was involved in the big fraud affair concerning the Berlin art dealer Otto Wacker. Faille wrote certificates of authenticity for 30 paintings which turned out to be fakes.