A Chester County biopharmaceutical company working on treatments for a variety of fibrotic and inflammatory diseases has a new chief executive officer. Complexa Inc. of Berwyn, Pa., said Monday that Francisco D. Salva has taken over as president and CEO of the company effective immediately. He takes over the posts from Josh Tarnoff, who has served as CEO since 2011. The company did not disclose the reason for Tarnoff's departure. Complexa was involved in one of the largest private equity deals...