Complex sentence: Based on past experience, SCLC was confident that Judge Johnson would eventually lift the restraining order and they did not want to alienate one of the few southern judges who was often sympathetic to their cause by violating his injunction.
Split into simpler sentences: Based on past experience, SCLC was confident that Judge Johnson would eventually lift the restraining order. They did not want to alienate one of the few southern judges who had displayed sympathy to their cause by violating his injunction.