This verse is part of a longer passage in Numbers 7 that describes the offerings brought by the leaders of the twelve tribes of Israel for the dedication of the Tabernacle. Let's break it down:

"On the fourth day...": This indicates the specific day within a twelve-day period when this particular offering was made. Each tribe's leader brought the same offering on a different day, signifying their equal participation and dedication.

"Elizur the son of Shedeur...": This identifies the individual bringing the offering. Elizur is the personal name of the leader, and Shedeur is his father's name. This lineage is important for establishing his identity and authority within the tribe.

"prince of the children of Reuben...": This states Elizur's title and affiliation. He is the "prince" (or chieftain, leader) of the tribe of Reuben. This highlights his position of leadership and responsibility for his tribe.

In essence, the verse is a record of a specific event: On the fourth day of the Tabernacle dedication, Elizur, the leader of the tribe of Reuben and son of Shedeur, made his offering.

Significance and Context:

Order and Organization: The detailed record of each offering demonstrates the importance of order and organization in the religious practices of the Israelites.
Tribal Representation: Each tribe is represented by its leader, emphasizing the unity and collective responsibility of the twelve tribes.
Dedication and Offerings: The passage underscores the significance of dedicating the Tabernacle to God and the importance of offerings in their worship.
Equal Participation: While the leaders were prominent, the fact that each tribe brought the same offering on different days implies a sense of equality and shared commitment.

Therefore, this verse is not just a simple statement of fact, but a meaningful part of a broader narrative about the dedication of the Tabernacle and the organization of the Israelite tribes.