Complex sentence: In 1993, Goetzman was executive producer of Demme's "Philadelphia", starring Tom Hanks, beginning a working relationship with Hanks who both went on to co-found The Playtone Company.
Split into simpler sentences: In 1993, Goetzman was executive producer of Demme's "Philadelphia", starring Tom Hanks. It was here he began a working relationship with Hanks and went on to co-found The Playtone Company.