Complex sentence: During a live performance he stated that he had a Greek nationality and lived there for a few years, he couldn't go back and had to wait for his passport to expire beacause he should had gone to the army since he had a Greek nationality.
Split into simpler sentences: During a live performance he stated that he had a Greek nationality and lived there for a few years. He couldn't go back and had to wait for his passport to expire because he should have gone to the army since he had a Greek nationality.