MADRID — “Marrowbone,” the awaited directorial debut of Sergio G. Sanchez, screenwriter of “Jurassic World 2” director J.A. Bayona’s “The Orphanage” and “The Impossible,” will screen at this year’s San Sebastian Festival, the highest-profile film event in the Spanish-speaking world. As will Florida-set “Life and Nothing More,” Spaniard Antonio Mendez Esparza’s follow-up to Cannes Critics’...