What does 2 Chronicles 29:34 mean?

But there weren’t enough priests to handle all the burnt offerings, so their relatives the Levites helped them until the work was done and more priests had purified themselves. The Levites were actually more careful about purifying themselves than the priests were. 2 Chronicles 29:34 - Modern Text Bible

(There was so much to do that the Levites had to step in and help, because not enough priests were ready. The Levites had been more diligent about getting themselves ready for service.)