Complex sentence: When he died his bequests also went to the Frick Collection and it currently houses his Library and archives which include auction catalogs, periodicals, works on clocks, books on Egyptology and Classical subjects, and his diaries.
Split into simpler sentences: When he died his bequests also went to the Frick. It currently houses his Library and archives which include auction catalogs, periodicals, works on clocks, books on Egyptology and Classical subjects, and his diaries.