Complex sentence: Carson attended Southwestern High School in Southwest Detroit where he excelled in JROTC, a program sponsored by the United States Armed Forces, where he quickly rose to cadet colonel, highest ranking cadet in his area.
Split into simpler sentences: Carson attended Southwestern High School in Southwest Detroit where he excelled in JROTC, a program sponsored by the United States Armed Forces. He quickly rose to cadet colonel, highest ranking cadet in his area.