Complex sentence: He played with Ambrosia from 1977--1983; and with Shadowfax from 1984--1990, with whom he won the Grammy for "Best New Age Performance" for "Folksongs for a Nuclear Village" in 1988.
Split into simpler sentences: He played with Ambrosia from 1977--1983 and with Shadowfax from 1984--1990. He won a Grammy with Shadowfax for "Best New Age Performance" for "Folksongs for a Nuclear Village" in 1988.