Complex sentence: In the late nineteenth century developments in Scottish art are associated with the Glasgow School, a number of loose groups including the Glasgow Boys, who included James Guthrie, Joseph Crawhall, George Henry and E. A. Walton, who were influenced by French Impressionism and Realism.
Split into simpler sentences: In the late nineteenth century developments in Scottish art are associated with the Glasgow School. This was made up of loose groups including the Glasgow Boys, of James Guthrie, Joseph Crawhall, George Henry and E. A. Walton, who were influenced by French Impressionism and Realism.