We say that somebody/something is between two or more clearly separate people or things. We use among when somebody/something is in a group, a crowd or a mass of people or things, which we do not see separately. Compare:
She was standing between Alice and Mary. She was standing among a crowd of children. Our house is between the wood, the river and the village. His house is hidden among the trees.
We use between to say that there are things (or groups of things) on two sides. BETWEEN AMONG
a little valley between high mountains I saw something between the wheels of the car.
We say divide between and share between before singular nouns. Before plural nouns, we can say between or among.
He divided his money between his wife, his daughter and his sister. I shared the food between/among all my friends.