Complex sentence: It has served as the home of the Theta Lambda Chapter of Creighton University's Pi Kappa Alpha fraternity since 1981, of which the fraternity renovated the interior into apartment style housing.
Split into simpler sentences: It has served as the home of the Theta Lambda Chapter of Creighton University's Pi Kappa Alpha fraternity since 1981. The fraternity has renovated the interior into apartment style housing.