Complex sentence: Cohen was considered to be one of the major community builders/philanthropists in Winnipeg and he was a large contributor to the Royal Winnipeg Ballet, Manitoba Theatre Centre, Winnipeg Symphony Orchestra, Manitoba Opera, and various Winnipeg hospitals.
Split into simpler sentences: Cohen was considered to be one of the major community builders/philanthropists in Winnipeg. He has been a large contributor to the Royal Winnipeg Ballet, Manitoba Theatre Centre, Winnipeg Symphony Orchestra, Manitoba Opera, and various Winnipeg hospitals.