Complex sentence: Armenians were beaten, raped, and killed both on the streets of Sumgait and inside their apartments in three days of violence that only subsided when Soviet armed forces entered the city and quelled much of the rioting on 1 March.
Split into simpler sentences: Armenians were beaten, raped, and killed both on the streets of Sumgait and inside their apartments in three days of violence. The pogrom subsided only three days later when Soviet armed forces entered the city and quelled much of the rioting on 1 March.