Complex sentence: He appears in the episodes "Fearful Symmetry", "Question Authority", "Double Date" and "Grudge Match", and makes cameo appearances in "Flashpoint", "Panic in the Sky" and the series finale "Destroyer".
Split into simpler sentences: He appears in the episodes "Fearful Symmetry", "Question Authority", "Double Date" and "Grudge Match". He makes cameo appearances in "Flashpoint", "Panic in the Sky", and the series finale "Destroyer".