Complex sentence: Joining the Rangers is 2nd Lieutenant Arnold Dittmann (Edd Byrnes), a by-the-book West Pointer who is humanized by his encounter with Angelina De Lotta (Etchika Choureau).
Split into simpler sentences: Joining the Rangers is Second Lieutenant Arnold Dittmann (Edd Byrnes), a by-the-book West Pointer. Lt. Dittmann is humanized by his encounter with Angelina De Lotta (Etchika Choureau).