Complex sentence: Its boundaries are defined in large part by the village's position at the junction of Perkiomen Creek and the Schuylkill River, waterways that also defined much of the village's early history.
Split into simpler sentences: Its boundaries are defined in large part by the village's position at the junction of Perkiomen Creek and the Schuylkill River. The two waterways defined much of the village's early history.