Complex sentence: North of the memorial is the Journal Record Building, which formerly housed the offices of the "The Journal Record" and which now houses the Oklahoma City National Memorial Museum, which features numerous exhibits and artifacts related to the Oklahoma City bombing.
Split into simpler sentences: North of the memorial is the Journal Record Building, which formerly housed the offices of the "The Journal Record". It now houses the Oklahoma City National Memorial Museum, which features numerous exhibits and artifacts related to the Oklahoma City bombing.