Complex sentence: Dillin's tenure on "JLA" included the reintroduction of Red Tornado; the migration of the Black Canary from Earth-2 to Earth-1; and the introduction of the JLA satellite.
Split into simpler sentences: Dillin's tenure on "JLA" included the reintroduction of Red Tornado. They also oversaw the migration of the Black Canary from Earth-2 to Earth-1; and the introduction of the JLA satellite.