Complex sentence: Police said that Hutton and Eldridge Cleaver were holed up at 1218 28th Street and were armed with two 9mm automatic pistols, two AR-15 and one M-14 military type automatic rifles and a large supply of ammunition, some of it armor piercing.
Split into simpler sentences: Police said that Hutton and Eldridge Cleaver were holed up at 1218 28th Street. And were armed with two 9mm automatic pistols, two AR-15 and one M-14 military type automatic rifles and a large supply of ammunition, some of it armor piercing.