Complex sentence: He opened his barbershop to wait for an answer to his telegram, which never came and was unaware that 15 police officers and 25 National Guardsmen were sent to surround his establishment that afternoon.
Split into simpler sentences: He opened his barbershop to wait for an answer to his telegram which never came. He was unaware that 15 police officers and 25 National Guardsmen were sent to surround his establishment that afternoon.