Simplify the following text for a Grade 11 native English-speaking person.
Original: At its basic level , MT performs simple substitution of words in one natural language for words in another , but that alone usually can not produce a good translation of a text , because recognition of whole phrases and their closest counterparts in the target language is needed .
Simplified: At its basic level , MT performs simple substitution of words in one natural language for words in another ( see literal translation ) .