Complex sentence: This commitment to standardized units can be seen in the short-lived experiment of the Marine Raiders, which was controversial, while the U.S. Army's 75th Ranger Regiment, born in World War II, enjoys high prestige to this day.
Split into simpler sentences: This commitment to standardized units can be seen in the short-lived experiment of the Marine Raiders, born in World War II, was controversial. While the U.S. Army's 75th Ranger Regiment, also born in World War II, enjoys high prestige to this day.