Complex sentence: Music was recorded in April 1971 and second recording sessions in August/September 1971.35th years anniversary OST was issued in 2006 with previously never released recording session and alternate takes.
Split into simpler sentences: Music was recorded in April 1971 and second recording sessions in August/September 1971. A 35th anniversary OST was issued in 2006 with previously never released recording session and alternate takes.