Complex sentence: On 16 June 1958 the 509th BW was transferred to Pease AFB, New Hampshire, and in 1966, transitioned to the B-52E and KC-135A and concurrently supported both SAC nuclear alert missions stateside and deployed contingency operations in Southeast Asia.
Split into simpler sentences: On 16 June 1958 the 509th BW was transferred to Pease AFB, New Hampshire. In 1966 the 509th transitioned to the B-52E and KC-135A and concurrently supported both SAC nuclear alert missions stateside and deployed contingency operations in Southeast Asia.