Complex sentence: In March 1963, Oswald purchased a 6.5 mm caliber Carcano rifle for $29.95 by mail-order, using the alias "A. Hidell", as well as a.38 Smith & Wesson Model 10 revolver by the same method.
Split into simpler sentences: In March 1963, Oswald used the alias "A. Hidell" to make a mail-order purchase of a 6.5 mm caliber Carcano rifle for $29.95. He also purchased a.38 Smith & Wesson Model 10 revolver by the same method.