Complex sentence: Next generation Generalmusic arranger keyboards were the WK series; again, they offered more sophisticated SK series as a synth-arranger alternative and Equinox as a standalone Kurzweil K2500 clone.
Split into simpler sentences: Next generation Generalmusic arranger keyboards were the WK series. Again, they offered a more sophisticated SK series as a synth-arranger alternative and Equinox as a standalone Kurzweil K2500 clone.