Complex sentence: These narrow walkways are what splits up Rancho Nuevo into three neighborhoods: three of them are all simply known as Rancho Nuevo, while the last, bordering the mountainscape, is called La Remo.
Split into simpler sentences: These narrow walkways are what splits up Rancho Nuevo into three neighborhoods. Three of which are all simply known as Rancho Nuevo with the last neighborhood bordering the mountain scape is called La Remo.