Complex sentence: Mr Fox, feeling responsible for the whole affair, invites the other animals to a feast made from the loot and they all decide to make an underground town where they will be safe, while discreetly obtaining food from the farmers.
Split into simpler sentences: Mr Fox, feeling responsible for the whole affair, invites the other animals to a feast made from the loot. At the feast, the animals decide to make an underground town where they will be safe, while discreetly obtaining food from the farmers.