Complex sentence: In 1928, Ben Nicholson and Christopher Wood visited St Ives where they were impressed by the work of local artist Alfred Wallis, and this started the development of the Cornish fishing port as an artists' colony.
Split into simpler sentences: In 1928, Ben Nicholson and Christopher Wood visited St Ives where they were impressed by the work of local artist Alfred Wallis. This started the development of the Cornish fishing port as an artists' colony.