Complex sentence: He studied law at Universidad de Santiago de Compostela; after graduation, he worked in television, both on-screen (appearing on Televisión de Galicia) and behind-the-scenes as a writer.
Split into simpler sentences: He studied law at Universidad de Santiago de Compostela. After graduation, he worked in television, both on-screen (appearing on Television de Galicia) and behind-the-scenes as a writer.