Simplify the following text for a Grade 6 native English-speaking person.
Original: TAM â `` TÃ xi AÃ reo MarÃ lia and TAM â `` Transportes AÃ reos Regionais were two different entities , although both belonged to the TAM Group .
Simplified: TAM Airlines ( TAM Linhas AÃ reas in Portuguese ) is Brazilian airline . TAM was an abbreviation of , Air Taxis of MarÃ lia .