Complex sentence: The society was instrumental in the first Boskone science fiction convention, in NESFA, Noreascon in 1971, and the World Science Fiction Society, which sponsors the Hugo awards is still located in Cambridge.
Split into simpler sentences: The society was instrumental in the first Boskone science fiction convention, in NESFA, Noreascon in 1971, and others. The World Science Fiction Society, which sponsors the Hugo awards, is still located in Cambridge.