Complex sentence: Linda Barnhizer and Alan Naldrett, two local promoters who occasionally ran shows at Fort Mason (another venue in the area), successfully convinced Celso that punk music would be a good match for the club.
Split into simpler sentences: Linda Barnhizer and Alan Naldrett were two local promoters who occasionally ran shows at Fort Mason, another venue in the area. They successfully convinced Celso that punk music would be a good match for the club.