Complex sentence: Umberto Boccioni (19 October 1882--17 August 1916) was an Italian painter and sculptor who helped shape the revolutionary aesthetic of the Futurism movement as one of its principal figures.
Split into simpler sentences: Umberto Boccioni (19 October 1882--17 August 1916) was an influential Italian painter and sculptor. He helped shape the revolutionary aesthetic of the Futurism movement as one of its principal figures.