Complex sentence: He became a Roman Catholic at the behest of his wife, Annette, but was always thought of as a Jew, the establishment was shocked to find out on his death that he had converted many years before.
Split into simpler sentences: He became a Roman Catholic at the behest of his wife, Annette, but was always thought of as a Jew. The establishment was shocked to find out on his death that he had converted many years before.