Complex sentence: The unpopularity of the bottlenecked case led Stevens around 1897 to develop the.25-21, by shortening its own.25-25 of 1895, both designed by Capt. W. L. Carpenter, 9h U.S. Infantry Barnes, "op. cit.", p.74.
Split into simpler sentences: The unpopularity of the bottlenecked case led Stevens to develop the.25-21 in 1897. Designed by Capt. W. L. Carpenter, 9h U.S. Infantry, the.21-21 Stevens was essentially a shortened version of the company's own.25-25 of 1895 Barnes, "op. cit.", p.74.