Complex sentence: It was initially a gritty working-class neighborhood but experienced rapid transformation since the 1990s and now boast similar demographics to its neighboring Potrero Hill-an upper middle-class working professional neighborhood.
Split into simpler sentences: It was initially a gritty working-class neighborhood, but has experienced rapid transformation since the 1990s. Now it boasts similar demographics to its neighboring Potrero Hill-an upper middle-class working professional neighborhood.