Complex sentence: Written by Jackson, it is in the key of B major (or more precisely, B Mixolydian mode) and in common time signature, the song was the first solo recording over which Jackson had creative control.
Split into simpler sentences: Written by Jackson, it is in the key of B major (or more precisely, B Mixolydian mode) and in common time signature. The song was the first solo recording over which Jackson had creative control.