Complex sentence: The densely-built village sits where two small rivers join--the Auvestre and the Colostre--in a glacially-widened valley in a district of fields of commercially-grown lavender, which support a honey-making industry.
Split into simpler sentences: The densely-built village sits where two small rivers join--the Auvestre and the Colostre--in a glacially-widened valley. Riez is located in a district of fields of commercially-grown lavender, which support a honey-making industry.