Complex sentence: First synthesized by DuPont research chemists around 1952, the company filed for patent protection of the homopolymer in 1956 and completed construction of a plant to produce Delrin at Parkersburg, West Virginia, in 1960.
Split into simpler sentences: First synthesized by DuPont research chemists around 1952, the company filed for patent protection of the homopolymer in 1956. DuPont and completed construction of a plant to produce Delrin at Parkersburg, West Virginia, in 1960.