Complex sentence: Lyrically, "Tonight, Tonight" hangs together with the rest of the "Mellon Collie", which is a concept album, as a symbol for the cycle of life and death.
Split into simpler sentences: Lyrically, "Tonight, Tonight" conceptually hangs together with the rest of the "Mellon Collie", which is a concept album. The album is a symbol for the cycle of life and death.