Complex sentence: As a young, energetic, and charismatic leader, Roberts embodied much of the Red Power Movement and became a guiding voice for change at a time when Indian sovereignty was at a countrywide high.
Split into simpler sentences: As a young, energetic, and charismatic leader, Roberts embodied much of the Red Power Movement. He was a guiding voice for change at a time when Indian sovereignty was at a countrywide high.