Complex sentence: In fact, in 1890 Paul Rudolph designed the Zeiss Anastigmat with two cemented doublets, then in 1899 he took apart the doublets in the Zeiss Anastigmat to produce the four element, four group Unar lens.
Split into simpler sentences: In fact, in 1890 Paul Rudolph designed the Zeiss Anastigmat with two cemented doublets. Later, in 1899, he took apart the doublets in the Zeiss Anastigmat to produce the four element, four group Unar lens.