Simplify the following text for a Grade 10 native English-speaking person.
Original: Rome had been awarded the organization of the 1908 Summer Olympics , but after the 1906 eruption of Mount Vesuvius , was forced to decline and pass the honors to London .
Simplified: Rome had been awarded the organization of the 1908 Summer Olympics , but , after the 1906 eruption of Mount Vesuvius , London became the host .