The underlined portion would be a subordinate clause.
Answer:
Thinking he might be hurt Robert ran in to help.
Explanation:
It should be:
Thinking he might be hurt, Robert ran in to help.
I hope this helps.
Harriet Tubman was a slave who got whipped as a child whenever she misbehaved, so she ran away and worked as a planter for a man named James Cook. Education was unheard of because of race issues.