Complex sentence: However, early camera club photography continued to use glass plates until the early 20th century, when the technical and artistic capabilities of film could approach that of glass; while outside processing was typically not permitted in camera clubs until the color photography era.
Split into simpler sentences: However, early camera club photography continued to use glass plates until the early 20th century, when the technical and artistic capabilities of film could approach that of glass. Outside processing was typically not permitted in camera clubs until the color photography era.