Answer:
Born on 29 September 1758 in Burnham Thorpe, Norfolk, Horatio Nelson was the sixth of the 11 children of a clergyman. He joined the navy aged 12, on a ship commanded by a maternal uncle. He became a captain at 20 and saw service in the West Indies, Baltic, and Canada.
Explanation:
I believe that the best answer for this question is "are." You are referring to two parties here, both the lion tamer and the clowns. This would mean that your applicable verbs must also be plural. Since "are" is the plural version of "is," it is the most suitable word to use in this situation. Hope this helps.