Complex sentence: He returned to EWF in 1981 replacing former member Al McKay and performing on the albums "Raise!", "Powerlight" and "Electric Universe" until 1983 when the group went on a four year hiatus.
Split into simpler sentences: He returned to EWF in 1981 replacing former member Al McKay and performed on their albums "Raise!", "Powerlight" and "Electric Universe". He left the band in 1983 when the group went on a four year hiatus.