Complex sentence: The city's main population is concentrated near the L'Assomption River in the southernmost part of the city, bordering the city of Repentigny, and the Saint Lawrence River, while the northern part is mostly farmland, it is being developed as a suburban area.
Split into simpler sentences: The city's main population is concentrated near the L'Assomption River in the southernmost part of the city, bordering the city of Repentigny, and the Saint Lawrence River. The northern part is mostly farmland, and is being developed as a suburban area.