Complex sentence: Forsyth is best-known for his work in ceramics, particularly lustreware, but he also designed stained glass windows for St. Joseph's Roman Catholic church in Burslem in the late 1920s.
Split into simpler sentences: Forsyth is best-known for his work in ceramics, particularly lustreware. However, he did work in other media, notably stained glass: he designed stained glass windows for St. Joseph's Roman Catholic church in Burslem in the late 1920s.