Original: After Hargreaves' death in 1988, his son, Adam Hargreaves, began writing and illustrating new stories involving the Mr. Men and Little Miss characters, including the creation of ten new characters, four of which were inspired by work Roger Hargreaves had produced before his death.
Simplified: After Hargreaves died in 1988, his son, Adam Hargreaves, began writing and illustrating new stories about the Mr. Men and Little Miss characters. He created ten new characters; four of them were inspired by work Roger Hargreaves had produced before his death.