Complex sentence: After visiting the project, McKay was so impressed with what he saw and felt he decided to add two more buildings to the school construction, which were later named the David O. McKay Auditorium and the Matthew Cowley Administration Building.
Split into simpler sentences: After visiting the project, McKay was so impressed with what he saw and felt he decided to add two more buildings to the school's construction. These buildings were later named the David O. McKay Auditorium and the Matthew Cowley Administration Building.