Complex sentence: The first synthesizer to incorperate his algorithm was Yamaha's GS1 in 1975, it was an analog synthesizer and some though it to be to expensive at the time, Chowning included.
Split into simpler sentences: The first synthesizer to incorporate his algorithm was Yamaha's GS1 in 1975, an analog synthesizer. Some thought it too expensive at the time, Chowning included.