Complex sentence: Abbott, 5 The first independent settlement was probably on the Palatine hill, while independent settlements also formed on the Quirinal, Esquiline, Capitoline, and Caelian hills.
Split into simpler sentences: Abbott, 5 The first independent settlement was probably on the Palatine. Independent settlements also formed on the Quirinal, the Esquiline, the Capitoline, and the Caelian hills.