Complex sentence: He was admired by Robert Louis Stevenson and painted a view of his house at Swanston, and the construction of Dubh Artach lighthouse, which was undertaken by the brothers Thomas and David Stevenson, Robert Louis' father and uncle respectively.
Split into simpler sentences: He was admired by Robert Louis Stevenson and painted a view of his house at Swanston, and the construction of Dubh Artach lighthouse. The engineering work for the latter was undertaken by the brothers Thomas and David Stevenson, Robert Louis' father and uncle respectively.