Complex sentence: He was rendered comatose by the crystal, and Lilandra then took over as the Majestrix of the Shi'ar Empire; and the X-Men, as well as most of Earth's other superheroes, have had cordial if not friendly relations with the Shi'ar Empire ever since.
Split into simpler sentences: He was rendered comatose by the crystal, and Lilandra then took over as the Majestrix of the Shi'ar Empire. The X-Men, as well as most of Earth's other superheroes, have had cordial if not friendly relations with the Shi'ar Empire ever since.