Complex sentence: In addition to Eastern Conference, Rawkus Records, Fondle' Em Records, Solesides, and Stones Throw Records were established during this time period, the former two in New York alongside Eastern Conference and the latter two in California.
Split into simpler sentences: In addition to Eastern Conference, Rawkus Records, Fondle' Em Records, Solesides, and Stones Throw Records were established during this time period. The former two were based in in New York alongside Eastern Conference, and the latter two in California.