Complex sentence: Aside from the long narrow beak, the skull also had teeth in the premaxilla, or upper beak (a primitive trait among ornithopods), and long rod-like bones called palpebrals over the eyes, giving it heavy bony eyebrows.
Split into simpler sentences: Aside from the long narrow beak, the skull also had teeth in the premaxilla, or upper beak (a primitive trait among ornithopods). Long rod-like bones called palpebrals were present over the eyes, giving it heavy bony eyebrows.