It is easy to understand what some of the fears might be about having a girl on an all-male team, particularly one that places such an emphasis on direct physical contact.
How is the quote not a run-on? How is it a sentence?
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It's not a run-on sentence because the portion after the comma contains a relative pronoun one, which refers back to all-male team, making this a bound relative clause.
Alternatively, it could have been written with a dash instead of a comma, but the comma is fine. In order for this to be a run-on, the statement after the comma would have to be an autonomous, complete sentence, and it isn't.
I'd say it's not a run-on sentence because it only has two clauses, albeit long ones. If it went on for more than that, the author would risk tying too many ideas together and making the point difficult to understand. I'm quite partial to the double dash in place of the comma in this type of sentence--to me, it signals that it might be helpful to pause to consider the beginning of the sentence before moving on.