What does 1 Chronicles 6:29 mean?

Shemer's son was Mahli, Mahli's son was Mushi, Mushi's son was Merari, and Merari was the son of Levi. 1 Chronicles 6:29 - Modern Text Bible

(This verse connects Ethan's line back to Merari and then to Levi, showing the three main branches of the Levite tribe.)