Complex sentence: Ambassador Unger pressured the RLAF to strike communist forces on the Plaine des Jarres and the Ho Chi Minh Trail by presenting the Royalist government with a list of targets that he wanted the RLAF to hit.
Split into simpler sentences: Ambassador Unger pressured the RLAF to strike communist forces on the Plaine des Jarres and the Ho Chi Minh Trail. Unger presented the Royalist government with a list of targets that he wanted the RLAF to hit.