EF2/3 sentence combining

1. We were riding red and white rented bicycles on the Seawall.
We were riding red and white bicycles which we had rented on the Seawall.

2. We wore red helmets which were required for safety.
We wore red helmets because they were required for safety.


3. The Seawall was busy and crowded with people who were walking and rollerblading.

4. We rode slowly.  I rode in the middle, my brother rode in front, and our friend rode behind.
We rode slowly with me in the middle, my brother in front, and our friend behind.

5. After we rode for an hour without stopping, I was out of breath.  My legs were tired, but I was happy.

6. I was out of breath, and my legs were tired because we rode for an hour without stopping.  However, I was happy.

I was happy after we rode for an hour without stopping even though I was out of breath and my legs were tired.