Complex sentence: The Philadelphia Police Department patrols six districts located within North Philadelphia: the 22nd, 23rd, 25th, 26th, 35th, and 39th districts.
Split into simpler sentences: The Philadelphia Police Department patrols six districts located within North Philadelphia. The six patrol districts serving North Philadelphia are the 22nd, 23rd, 25th, 26th, 35th, and 39th districts.