Complex sentence: Shared Common House meals are a central and defining aspect of the community, providing a regular opportunity to keep in touch with, and deepen relationships with one's neighbors, as well as work alongside each other making the meal and cleaning up afterwards.
Split into simpler sentences: Shared Common House meals are a central and defining aspect of the community. They provide a regular opportunity to keep in touch with one's neighbors, deepen relationships, and work together while making the meal and cleaning up afterwards.