Bob ran down the road.
He fell over.

Bob fell over because he ran to fast down the road.

The thunder roared.
The hobbits hid.

The hobbits were alarmed as the thunder roared, so they hid.

Bilbo slept in a cave.
The goblins attacked.

Not knowing what was happening, Bilbo slept in a cave while the evil goblins attacked.

The cart came to a wheezing halt.
Gandalf strode into the hobbit hole.

The cart came wheezing to a halt  as Gandalf strode into the hobbit hole.

Jim was interested in the idea.
He rang his friend.

Jim rang his friend because he was interested in the idea.

Owls are nocturnal.
This means they are active at night.
They have excellent eyesight.

Due to owls having excellent eyesight, they are active at night since they are nocturnal