Complex sentence: Seaweed was keyboard player for much of the 1990s, he was previously a member of the Thunderdogs (who toured with French circus troupe Archaos in the early 1990s) and Moksha.
Split into simpler sentences: Seaweed was keyboard player for much of the 1990s. He was previously a member of the Thunderdogs (who toured with French circus troupe Archaos in the early 1990s) and Moksha.