Complex sentence: The Doctor, having since regenerated into his seventh persona, next encounters Glitz on Iceworld on the planet Svartos ("Dragonfire"), where Glitz has become a mercenary for the power-mad Kane in order to pay his debts.
Split into simpler sentences: The Doctor, having since regenerated into his seventh persona, next encounters Glitz on Iceworld on the planet Svartos ("Dragonfire"). On this occasion, Glitz has become a mercenary for the power-mad Kane in order to pay his debts.