Complex sentence: The Vancouver version of the UWA Heavyweight Championship was the top singles title in All Star Wrestling from its establishment sometime after All Star disaffiliated from the National Wrestling Alliance in late-1985 until the promotion closed in 1989.
Split into simpler sentences: The Vancouver version of the UWA Heavyweight Championship was the top singles title in All Star Wrestling. It was established sometime after All Star disaffiliated from the National Wrestling Alliance in late-1985, and it lasted until the promotion closed in 1989.