New Revised Standard Version
Since more chief men were found among the sons of Eleazar than among the sons of Ithamar, they organized them under sixteen heads of ancestral houses of the sons of Eleazar, and eight of the sons of Ithamar.

Contemporary English Version
Eleazar's descendants were divided into 16 groups, and Ithamar's were divided into eight groups, because Eleazar's family included more family leaders.

New American Bible
But since the sons of Eleazar were found to be more numerous by male heads than those of Ithamar, the former were divided into sixteen groups, and the latter into eight groups, each under its family heads.

Douay-Rheims Bible
And there were found many more of the sons of Eleazar among the principal men, than of the sons of Ithamar. And he divided them so, that there were of the sons of Eleazar, sixteen chief men by their families: and of the sons of Ithamar eight by their families and houses.

And there were found many more of the sons of Eleazar among the principal men, than of the sons of Ithamar. And he divided them so, that there were of the sons of Eleazar, sixteen chief men by their families: and of the sons of Ithamar eight by their families and houses.

more

1 Chronicles 15:6-12 Of the sons of Merari, Asaia the chief, and his brethren two hundred and twenty. . . .

sons of Eleazar

Numbers 25:11-13 Phinees the son of Eleazar the son of Aaron the priest, hath turned away my wrath from the children of Israel: because he was moved with my zeal against them, that I myself might not destroy the children of Israel in my zeal. . . .

according

1 Chronicles 23:24 These are the sons of Levi in their kindreds and families, princes by their courses, and the number of every head that did the works of the ministry of the house of the Lord from twenty years old and upward.