Complex sentence: In 1827, Mason moved to Boston, where he continued his banking career for some time but also became music director for three churches including the Hanover Street whose pastor was the famous Lyman Beecher, in a six-month rotation.
Split into simpler sentences: In 1827, Mason moved to Boston, where he continued his banking career for some time. Mason eventually served as music director for three churches including the Hanover Street whose pastor was the famous Lyman Beecher, in a six-month rotation.