Original sentence: The instability of the empire became evident under his son, Humayun, who was driven out of India and into Persia by rebels.The restoration of Mughal rule began after Humayun’s triumphant return from Persia in 1555, but he died from a fatal accident shortly afterwards
Edited sentence: The instability of the empire became evident under his son, Humayun, who was defeated and driven out of India and into Persia by Sher Shah Suri the Tiger King().The martyrdom of King Sher Shah Suri in an incident of explosion of gunpowder magazine during the siege of Kalinjar fort made way Humanyun's return from Persia in 1555, but he died from a fatal accident shortly afterwards