Complex sentence: The record was produced by the band themselves, and issued in two different stereo mixes: one done by TTG staff recording engineer Val Valentin, and one by Lou Reed, dubbed the "closet mix" by guitarist Sterling Morrison.
Split into simpler sentences: The record was produced by the band themselves, and issued in two different stereo mixes. The other mix was done by Lou Reed, and was dubbed the "Closet Mix" by guitarist Sterling Morrison.