Complex sentence: The NWA Pacific Coast (Vancouver) Heavyweight Championship was the major singles title in the National Wrestling Alliance's Vancouver, British Columbia territory, NWA All-Star Wrestling from 1970 until 1981, when the title was abandoned.
Split into simpler sentences: The NWA Pacific Coast (Vancouver) Heavyweight Championship was the major singles title in the National Wrestling Alliance's Vancouver, British Columbia territory, NWA All-Star Wrestling. It existed from 1970 until 1981, when the title was abandoned.