Simplify the following text for a Grade 10 native English-speaking person.
Original: Aluminium sulfate , alternatively spelt aluminum sulfate , aluminium sulphate , or aluminum sulphate ; is a chemical compound with the formula Al2 ( SO4 ) 3 .
Simplified: Aluminium sulfate , sometimes spelled aluminum or sulphate , is a chemical compound . Its chemical formula is Al2 ( SO4 ) 3 .