Complex sentence: North co-founded Buddyhead Records in 2000 alongside Travis Keller as an extension of the website that they had started in 1998, which is best known for its outspoken and often cynical commentary on celebrity and popular culture and its irreverent humor.
Split into simpler sentences: North co-founded Buddyhead.com in 1998, and Buddyhead Records alongside Travis Keller as an extension of the website. Buddyhead was best known for its outspoken and often cynical commentary on celebrity and popular culture and its irreverent humor.