Complex sentence: The building that the Transition Program resides in is the Auditorium Annex, located on West Mall above the Math Graduates office, across from the Pacific Institute of Mathematical Sciences building and behind the Walter C. Koerner Library.
Split into simpler sentences: The building that the Transition Program resides in is the Auditorium Annex located on West Mall. It is above the Math Graduates office, across from the Pacific Institute of Mathematical Sciences building, and behind the Walter C. Koerner Library.