Screen Story by Sean McNamara & Deborah Schwartz & Douglas Schwartz & Michael Berk and Matt R. Allen & Caleb Wilson & Brad Ganin based on the book by Bethany Hamilton, Sheryl Berk, and Rick Bundshuh
Screenplay by Sean McNamara & Deborah Schwartz & Douglas Schwartz & Michael Berk
And it's not what you'd call a very complex story, as opposed to say the ten-hour GAME OF THRONES, which has this screen credit:
Screenplay by David Benioff & D.B Weiss, based on the novel by George R.R. Martin
Or, say, INCEPTION, which had this screen credit:
Screenplay by Christopher Nolan
What was so daunting and complex about the story of a girl whose arm is bitten off by a shark that it would require a team of seven credited writers to adapt and four to write? It boggles the mind.