Which is the most effective way to combine sentences 10 and 11?
1. Eventually using the umbrella as protection from the rain as well as the sun, the Romans. 2. Eventually, the Romans used for protection from the rain as well as the sun, the umbrella. 3. Eventually, the Romans used the umbrella to protect themselves from the rain as well as the sun. 4. Eventually, the Romans using the umbrella to protect themselves from the rain as well as the sun.