Complex sentence: Portishead used several analog synthesisers, including a Korg MS-20, ARP 2600, Siel Orchestra, VCS 3, and also used a clavioline, an electronic keyboard that predates the synthesiser.
Split into simpler sentences: Portishead used several analog synthesisers, including a Korg MS-20, ARP 2600, Siel Orchestra, VCS 3. They also used a clavioline, an electronic keyboard that predates the synthesiser.