Complex sentence: Roosevelt Avenue is a main thoroughfare that starts at 48th street in the Sunnyside, Woodside, Jackson Heights, Corona, Elmhurst, and Flushing ends at 156th street and Northern Boulevard.
Split into simpler sentences: Roosevelt Avenue is a main thoroughfare that starts at 48th street. It goes through Sunnyside, Woodside, Jackson Heights, Corona, Elmhurst, and Flushing, and ends at 156th street and Northern Boulevard.