Complex sentence: Nicklaus continues to manage the Memorial Tournament he created in his home state of Ohio, which is played at Muirfield Village, a course which he co-designed with Desmond Muirhead and opened in 1974.
Split into simpler sentences: Nicklaus continues to manage the Memorial Tournament, which he created in his home state of Ohio. The event is played at Muirfield Village, a course that he co-designed with Desmond Muirhead and opened in 1974.