Complex sentence: Making his film debut in "Stage Struck" (1958), Plummer's career spans more than five decades, most famously as Captain von Trapp in "The Sound of Music" (1965).
Split into simpler sentences: Making his film debut in "Stage Struck" (1958), Plummer's career spans more than five decades. He is known for portraying Captain von Trapp in "The Sound of Music" (1965).