This verse is a standard concluding statement found in the books of Kings. Here's a breakdown of what it means:

"Jeroboam slept with his fathers, even with the kings of Israel": This is a common euphemism for death in the Old Testament. It doesn't literally mean Jeroboam was buried with his ancestors, but rather that he died and was buried in the royal tombs (likely in Samaria, the capital of the Northern Kingdom of Israel). "Sleeping with his fathers" is a way of saying he joined the lineage of past kings in death.

"and Zechariah his son reigned in his place": This simply means that upon Jeroboam's death, his son Zechariah succeeded him as king of Israel. This highlights the transfer of power from father to son.

In short, the verse signifies that Jeroboam died a natural death and was succeeded by his son, Zechariah, as king. It is a transitional statement marking the end of Jeroboam's reign and the beginning of Zechariah's (short and ill-fated) rule. It's worth noting that Zechariah's reign was short-lived and marked the end of the dynasty of Jehu, which had been promised to last four generations. He was assassinated after only six months.