Original: He has written eight numbered symphonies since—a symphonic cycle of the Symphonies Nos.1–7 (1976–2000), a Symphony No. 8 titled the 'Antarctic' (2000), a Sinfonia Concertante (1982), as well as the series of ten Strathclyde Concertos for various instruments (pieces born out of his association with the Scottish Chamber Orchestra, 1987–1996).
Simplified: He has written eight numbered symphonies since, a Sinfonia Concertante (1982), as well as the series of ten Strathclyde Concertos for various instruments (pieces he wrote when he worked with the Scottish Chamber Orchestra).