Complex sentence: The first prototype, the 1929 "Flying Wing (X- 216H)", evolved from earlier design studies, had twin rudders with a single horizontal stabilizer between them that were connected by twin booms to an thick, all-wing fuselage.
Split into simpler sentences: The first prototype, the 1929 "Flying Wing (X- 216H)", evolved from earlier design studies. It had twin rudders with a single horizontal stabilizer between them that were connected by twin booms to an thick, all-wing fuselage.