Complex sentence: From 1963 until 1983, the Soviets captured 17 World Championship titles amidst repeated accusations from Canada that their teams were made up of professionals masquerading as amateurs, eventually leading to Canada boycotting the 1972 Olympic hockey tournament.
Split into simpler sentences: From 1963 until 1983, the Soviets captured 17 World Championship titles amidst repeated accusations from Canada that their teams were made up of professionals masquerading as amateurs. The accusations eventually lead to Canada boycotting the 1972 Olympic hockey tournament.