What rules enable you to operate these sentences, even if you cannot say what they mean?

Colorless green ideas sleep furiously.

The man saw the boy with the binoculars.

We saw her duck.

They are hunting dogs.

The criminal experienced a seizure.

Police help dog bite victim.

While the man was hunting the deer ran through the forest.

If the police police police police, who polices the police police? Police police police police police police.