Complex sentence: Camp has written some of Smash Mouth's most memorable songs of the later 1990s and early 2000s, including "All Star" and "Then the Morning Comes".
Split into simpler sentences: Camp has written some of Smash Mouth's better songs, which are also some of the more memorable songs of the later 1990s and early 2000s. Camp penned "All Star" and "Then the Morning Comes".