Question

Is this a run-on sentence? According to legend, Spanish explorer Juan Ponce de León was searching for the Fountain of Youth, according to historians, he was more likely seeking political power.​

Answer 1

Answer: The question is slightly a run on

Another way you could help improve the question would be this:

According to the legend Spanish explorer Juan Ponce de Leon, he was searching for the Fountain of Youth, which according to historians it was assumed that he was more likely seeking political power.​

Explanation:

You could use other punctuation as well