Complex sentence: Residents reported that they had made several attempts to contact the Vigilance Police Station during the siege, but the police did not respond promptly, and arrived at the crime scene long after the gunmen had escaped.
Split into simpler sentences: Residents reported that they made several attempts to contact the Vigilance Police Station during the siege. However, the police did not respond promptly, and arrived at the scenes of the crime well after the gunmen had escaped.