Complex sentence: Glen Winter is a Canadian television director, cinematographer, and producer who is well known for his work on The WB/The CW's "Smallville"; as well as for his significant contributions to the "Arrowverse".
Split into simpler sentences: Glen Winter is a Canadian television director, cinematographer, and producer. He is well known for his work on The WB/The CW's "Smallville"; as well as for his significant contributions to the "Arrowverse".