Complex sentence: He studied at the Drama School of the National Theater of Greece (Ethniko Theatro) and made his stage debut in 1938, appearing as the Knight in William Sheakspeare's "King Lear".
Split into simpler sentences: He studied at the Drama School of the National Theater of Greece (Ethniko Theatro). He made his stage debut in 1938, appearing as the Knight in William Sheakspeare's "King Lear".