Read the sentences.
We collected shells. We wanted to use them to make a necklace.
Revise the sentences by adding a subordinate clause.
We collected shells, and we used them to make a necklace.
We collected shells; we wanted to use them to make a necklace.
We collected shells because we wanted to use them to make a necklace.
We collected shells; then, we used them to make a necklace.