They had to stay on topic. if they strayed to far people might not understand them. AND the entire goal of the Declaration of Independence was to bring the countries together so they understand.
A clause because a clause needs a subject and a verb in this sentence Buffalo is the subject and roam is the verb.
It will be the second one
They didn't have the knowledge which the English had which made them easier to take over since they didn't have to knowledge to take back what the English people had with made Johnson undertake his work