Complex sentence: This keyboard is the sister synth to the Korg Polysix and this model as well as the Polysix are being swiped up on the used vintage analog market as an alternative to often over-priced Moogs, Prophets, Oberheims, and Jupiters.
Split into simpler sentences: This keyboard is the sister synth to the Korg Polysix. The Mono/Poly, as well as the Polysix, are being swiped up on the used vintage synthesizer market as an alternative to often over-priced Moogs, Prophets, Oberheims, and Jupiters.