Complex sentence: However, CBS only allowed the advertisements if P&G refrained from disclosing the network to which the show was moving in their advertisements; this was also decreed when "The Edge of Night" moved to ABC in 1975.
Split into simpler sentences: However, CBS only allowed the advertisements if P&G refrained from disclosing the network to which the show was moving in their advertisements. This was agreed upon for "The Edge of Night" as well before it moved to ABC in 1975.