WTF?

I came across the following sentence in this article in the NYT Magazine

In the International Academy of Sex Research, the 35-year-old institution that publishes Archives of Sexual Behavior and that can claim, Bancroft said, most of the field’s leading researchers among its 300 or so members, women make up just over a quarter of the organization.

Not be overly critical (every writer turns a sour sentence once in a while) but what the hell happened here?