Complex sentence: Emmanuel had not had such comparatively high enrollment numbers since the 1970s, and as a result it has bought back one of its old dormitories, Julie Hall, which it had sold to Beth Israel Hospital during a time of financial crisis.
Split into simpler sentences: Emmanuel had not had such comparatively high enrollment numbers since the 1970s. To help accommodate them, the college bought back one of its old dormitories, Julie Hall, which it had sold to Beth Israel Hospital during a time of financial crisis.