Complex sentence: Team San Francisco (Team SF) was formed in 1987 in preparation for Gay Games III, which would be held in 1990, outside of San Francisco for the first time, in Vancouver, British Columbia.
Split into simpler sentences: Team San Francisco (Team SF) was formed in 1987 in preparation for Gay Games III, held in 1990. This would mark the first time that the Games were held outside of San Francisco, in Vancouver, British Columbia.