Simplify the following text for a Grade 8 native English-speaking person.
Original: Ali Baba ( Arabic : Ø Ù Ù Ø Ø Ø Ø Ê Ali BÄ ba ) is a fictional character , who is described in the adventure tale of Ali Baba and the Forty Thieves .
Simplified: Ali Baba ( Arabic : Ø Ù Ù Ø Ø Ø Ø Ê Ali BÄ ba ) is a fictional character from medieval Arabic literature . He is described in the adventure tale of Ali Baba and the Forty Thieves .