Complex sentence: When Jazz FM launched, the station played a mixture of mainstream jazz, with the daytime schedules originally dedicated to smooth jazz, and some soul programming, until 1992 when the policy changed and all non-jazz programming was taken off the schedules.
Split into simpler sentences: When Jazz FM launched, the station played a mixture of mainstream jazz, with the daytime schedules originally dedicated to smooth jazz, and some soul programming. In 1992, the policy changed and all non-jazz programming was taken off the schedules.