Complex sentence: Aside from being a stained glass artist and designer, Whall also did some watercolour, such as "The elf hour" which was exhibited at The New Gallery's Summer Exhibition of 1907.
Split into simpler sentences: Aside from being a stained glass artist and designer, Whall also worked in watercolour. One such work was "The elf hour" which was exhibited at The New Gallery's Summer Exhibition of 1907.