# People from all the tribes of Israel came after them

"People ... followed the Levites" or "People ... came to Jerusalem after the Levites". When the author speaks about Israel, he is now referring almost exclusively to the northern kingdom of Israel and not the united nation of Israel.

# those who set their hearts to seek Yahweh

"those who had determined to seek Yahweh" 

# to seek Yahweh

"to worship Yahweh"