Complex sentence: There wasn't allowed to use any midi what-so-ever, and only pre- 1975 instruments were applied: for instance keyboards like the mellotron, hammond organ, minimoog, rhodes, clavinet, ARP, piano and harpsichord.
Split into simpler sentences: There wasn't allowed to use any midi what-so-ever, and only pre- 1975 instruments were applied. Instruments includes classics like the mellotron, hammond organ, minimoog, rhodes, clavinet, ARP, piano and harpsichord.