Generate a more complex version of this sentence On June 17, 2008, Rivers won his first NBA Championship as a head coach after defeating the Los Angeles Lakers in six games.
Mesthine, versi sing luwih rumit saka ukara kasebut yaiku "Ing tanggal 17 Juni 2008, Rivers menangake Kejuaraan NBA sing pertama minangka pelatih kepala, sanajan Celtics butuh rekor NBA 26 game pasca musim kanggo menang. "