Complex sentence: In the Silver Age, she regularly appeared in comic books depicting the adventures of Superman's teenaged self, Superboy, and also appeared as an adult in numerous "Superman" titles, vying with Lois Lane for his attention.
Split into simpler sentences: In the Silver Age, she regularly appeared in series featuring the character's teenaged self, Superboy. She also often appeared as an adult in the Superman titles, vying with Lois Lane for his attention.