Complex sentence: Since 2003 NDI has had two advanced teams the S.W.A.T. (Super Wonderful Advanced Team) and the Celebration Team in that year NDI formed the Xcel team.
Split into simpler sentences: Since 2003 NDI has had two advanced teams: the S.W.A.T. (Super Wonderful Advanced Team) and the Celebration Team. In that year NDI formed the Xcel team.