Complex sentence: In 1764 he was made secretary to the colonial governor George Johnstone at Pensacola, Florida, and when he returned, two years later, to Great Britain, after a quarrel with Johnstone, he was allowed to retain his salary as a pension.
Split into simpler sentences: In 1764 he was made secretary to the colonial governor George Johnstone at Pensacola, Florida. He returned to Great Britain two years later, and, despite a quarrel with Johnstone, was allowed to retain his salary as a pension.