Complex sentence: "Tonight" is the 1999 debut single of New Zealand girl group TrueBliss, the first ever group to be formed under the "Popstars" banner, as part of the 1999 TVNZ series.
Split into simpler sentences: Tonight is the 1999 debut single of New Zealand girl group TrueBliss. TrueBliss were the first ever group to be formed under the "Popstars" banner, as part of the 1999 TVNZ series.