Complex sentence: The Strand group had performed at two large science fiction conventions, in Los Angeles and San Francisco and were offered a spot at The Mobuhay, A local punk club and even performed for children's television in Argentina.
Split into simpler sentences: The Strand group had performed at two large science fiction conventions in Los Angeles and San Francisco. They were offered a spot at The Mobuhay, a local punk club, and even performed for children's television in Argentina.