Complex sentence: Witold Lutosławski wrote his Symphony No.3 in 1973-1983; tha final period-1981-1983 The work was committed and given its world premiere by the Chicago Symphony Orchestra, conducted by Sir Georg Solti, on 29 September 1983.
Split into simpler sentences: Witold Lutosławski wrote his Symphony No.3 in 1973-1983. The Chicago Symphony Orchestra, conducted by Georg Solti, gave the world premiere on 29 September 1983.