Complex sentence: He maintains a recording studio in his home called Joe's Garage in which he has recorded and produced many major artists, other artists have also recorded in "Joe's Garage" while he has been on the road with Def Leppard.
Split into simpler sentences: He maintains a recording studio in his home called Joe's Garage in which he has recorded and produced many major artists. Artists have also recorded in Joe's Garage while he has been on the road with Def Leppard.