What does Ezra 8:35 mean?

The people who came back from exile offered burnt offerings to the God of Israel: twelve bulls for all Israel, ninety-six rams, seventy-seven lambs, and twelve male goats as a sin offering. All of it was a burnt offering to the Lord. Ezra 8:35 - Modern Text Bible

(The returned exiles worship God with sacrifices, representing all the tribes of Israel.)