Complex sentence: She was deployed to Guam, in the Mariana Islands, and conducted 18 deterrent patrols operating from there equipped with Polaris ballistic missiles before returning to the United States in 1969.
Split into simpler sentences: She was deployed to Guam, in the Mariana Islands, and operated from there into 1969. She conducted 18 deterrent patrols before returning to the United States, departing the western Pacific in 1969.