Complex sentence: As he anticipated, Chittagong proved remote and unviable, and as Sutanuti had been razed by the nawab's troops, the squadron sailed for Madras, arriving on 7 March 1689.
Split into simpler sentences: As he anticipated, Chittagong proved remote and unviable. As Sutanuti had in the meantime been razed by the nawab's troops, the squadron sailed for Madras, arriving on 7 March 1689.