Complex sentence: The OCC, created by San Francisco City Charter, has been known to solicit complaints from people contacted by police, and while the initial complaint volume appears high, the actual volume of sustained complaints against officers is very low for a department of its size.
Split into simpler sentences: The OCC, created by San Francisco City Charter, has been known to solicit complaints from people contacted by police. While the volume of initial complaints appears high, the volume of sustained complaints against officers is very low for a department of its size.