I have 2007 Kia Spectra. The belt broke and when I replaced it the engine dies.

Unfortunately, there are too many questions to provide an answer. Which belt broke? One of the drive belts? The timing belt (I hope not!) You ask about the Clutch assembly? Is this vehicle a standard transmission? Or are you referring to the clutch assembly for the a/c compressor? for the alternator? or for the cooling fan? Sounds like it needs to be checked out thoroughly. The only advice I can provide at this time is to check the tension of the belt, the condition of the pulleys and adjustment of belt tensioners. If you can't find the problem there, I suggest having it checked by a technician. We will be happy to do so here at the shop.