Complex sentence: The Pet Sounds 50th Anniversary World Tour is a worldwide concert tour by American musician Brian Wilson held to commemorate the 50th anniversary of the Beach Boys' album "Pet Sounds" (1966).
Split into simpler sentences: The Pet Sounds 50th Anniversary World Tour is a worldwide concert tour by American musician Brian Wilson. It will be in honor of the 50th anniversary of the Beach Boys' album "Pet Sounds" (1966).