Complex sentence: Not only do the FCC close down the network, but they also start censoring the citizens of Quahog, so the Griffin family travel to Washington, D.C. and convince the Congress to have the FCC's rules reversed.
Split into simpler sentences: Not only does the FCC close down the network but they also start censoring the citizens of Quahog. The members of the Griffin family travel to Washington, D.C. and convince the Congress to have the FCC's rules reversed.