Complex sentence: La Rumeur has involved itself in political activism in the suburbs of France, calling for attention to be paid to the often-ignored Paris massacre of 1961, as well as to police abuse, including "accidental" killings of young French people.
Split into simpler sentences: La Rumeur has involved itself in political activism in the suburbs of France. It also has attracted attention to the often-ignored Paris massacre of 1961, as well as to police abuse, including "accidental" killings of young French people.