Complex sentence: He would be instrumental in getting his brother Stewart's band, The Police, signed to a major record deal, and managed Sting, another member of The Police, for many years.
Split into simpler sentences: He would be instrumental in getting his brother Stewart's band, The Police, signed to a major record deal. He signed Gary Numan and the groups The Alarm, The Go-Go's & R.E.M. Miles managed Sting, another member of The Police, for many years.