Complex sentence: He withheld police protection for interracial bus riders who were staging a "Freedom Ride" from Washington D.C. to New Orleans, and many of the riders were badly beaten by white mobs at the Birmingham bus station due to Patterson's deliberate neglect.
Split into simpler sentences: He withheld police protection for interracial bus riders who were staging a "Freedom Ride" from Washington D.C., to New Orleans. Many of the riders were badly beaten by white mobs at the Birmingham bus station through Patterson's deliberate neglect.