Complex sentence: Prior to Mike's phone calls, all of the Losers had completely forgotten each other and the trauma of their childhood, burying the horror of their encounters with It; however, all but Stan reluctantly agree to return to Derry.
Split into simpler sentences: Prior to Mike's phone calls, all of the Losers had completely forgotten each other and the trauma of their childhood, burying the horror of their encounters with It. However, all but Stan reluctantly agree to return to Derry.