Complex sentence: A great deal of work was carried out to reclaim large areas of Chat Moss, particularly during the 19th century, and a large-scale network of drainage channels is required today to keep the land from reverting to bog.
Split into simpler sentences: A great deal of work was carried out to reclaim large areas of Chat Moss, particularly during the 19th century. A large-scale network of drainage channels is required to keep the land from reverting to bog.