Complex sentence: Various other patrons have contributed over the years and the assemblage today consists largely of Dutch, French and British works from the 17th to the 19th century, lithographs, etchings and some early 20th century British paintings.
Split into simpler sentences: Various other patrons have contributed over the years and the assemblage today consists largely of Dutch, French and British works from the 17th to the 19th century. This includes lithographs, etchings and some early 20th century British paintings.