v1-4: This incident is also recorded in 1 Kings 12.
Although Solomon had rid the land of certain bad influences (1 Kings 1-2), he could never do a perfectly thorough job. Jeroboam was well-known in Israel, and maintained a rebellious attitude against Solomon's family. The people sent for him, and he spoke for them.
It seems that his accusation about Solomon's heavy yoke was untrue. Had Rehoboam answered this differently, perhaps the outcome would have been different. But we are not allowed to know what would have happened!
v5-11: Rehoboam gave himself three days to make his decision. He rejected the counsel of the elders, those who had stood before Solomon and had heard his wisdom (9.7).
David had given specific instructions to Solomon (1 Kings 2.1-9; 1 Chr 28.9-21), but Solomon had not done this for Rehoboam. The issue of succession is important, in any situation. We are unwise to neglect it.
v12-15: Rehoboam answered the people harshly. This is no way to treat others, especially when you are supposed to be responsible for them. Contrast the elders' motivation in v7; "they will always be your servants". In 1 Kings 12.7, Rehoboam is mentioned as a servant to the people, but he did not become a servant.
v16-17: The cry of the rebels, see 2 Sam 20.1, and contrast 1 Chr 12.18. This chant was conceived by David's enemies who were amongst the people of Israel.
These events fulfilled Ahijah's prophecy (v15), yet Rehoboam remained responsible for his actions, for his failure to heed wise counsel, and his poor treatment of his people.
v18-19: Rehoboam went with Adoniram, apparently to collect taxation, but Israel stoned him, and Rehoboam barely escaped with his life.