This is the sum of the tabernacle, even of the tabernacle of testimony, as it was counted, according to the commandment of Moses, for the service of the Levites, by the hand of Ithamar, son to Aaron the priest.
This verse explains the total parts of the special shelter (also called the "witness tabernacle"), based on how many were counted following Moses' instructions. It was created to help the tribe of Levi, under the guidance of Ithamar, who was Aaron the priest's son, in their tasks.