Complex sentence: Often the need arises to make an actor appear taller, either because of their height, or because of the way a particular shot is composed, in this use Apple Boxes are jokingly referred to as "Man Makers".
Split into simpler sentences: Often the need arises to make an actor appear taller, either because of their height, or to fit with the composition of a particular shot. In this use Apple Boxes are jokingly referred to as "Man Makers".