Complex sentence: The ELF conducted armed actions in northern California and Oregon and disbanded in 1978 following Hanna's arrest for placing incendiary devices on seven crop-dusters at the Salinas, California airport on May Day, 1977.
Split into simpler sentences: The ELF conducted armed actions in northern California and Oregon. The original ELF disbanded in 1978 following Hanna's arrest for placing incendiary devices on seven crop-dusters at the Salinas, California airport on May Day, 1977.