In Telophase, which event occurs?

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In telophase, the key change is the formation of two separate nuclei. After the chromosomes have arrived at the opposite poles, they begin to de-condense back into thread-like chromatin, and the nuclear envelope re-forms around each chromosome set, creating two distinct nuclei within the cell. This reformation of nuclei is the defining event of telophase.

Chromatids separating happens in anaphase, when sister chromatids are pulled apart. Chromosomes aligning at the center happens in metaphase. Spindle fibers disassemble as mitosis winds down, but the crucial event that characterizes telophase is the re-formation of the nuclei.