Complex sentence: She has been an organizer for over 21 years for the 154/153 streets' Extended Family Reunion in Harlem, an event that brings residents from the neighborhood and residents that used to live in the area in July of each year.
Split into simpler sentences: She has been an organizer for over 21 years for the 154/153 streets extended family reunion in Harlem. An event that brings residents from the neighborhood and residents that used to live in the area in July of each year.