Simplify the following text for a Grade 5 native English-speaking person.
Original: Allison killed 41 people , of which 27 drowned . The storm also caused over $ 5 billion in damage ( 2001 USD , $ 6.4 billion 2007 USD ) , making Allison the deadliest and costliest tropical storm on record in the United States .
Simplified: Allison caused more than $ 5 billion in damage .