Complex sentence: The Cenacle was run under the supervision of Dom C. Shiarella, the treasurer of the First National Bank in New Kensington and the cashier of the Building Fund Campaign.
Split into simpler sentences: The Cenacle was run under the supervision of Mr. Dom C. Shiarella. Mr. Shiarella, who was the treasurer of the First National Bank in New Kensington, was the cashier of the Building Fund Campaign.