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The Mexican government announced it would ban the import of used cars other than 1998 models.
Literal
Mexican-government [topic-は] 1998-model [other-than-以外] [genitive-の] used-cars [genitive-の] import [object-を] will-ban [quotative-と] announced.
A news-report sentence. 以外 ('other than X,' 'except for X') is a noun-modifying suffix that forms 'non-X' phrases — attached to a noun, it creates 'things that are not X.' Here: 1998年型以外の中古車 = 'used cars other than 1998 models.' The quotative と marks the content of 発表する ('announce') — a reported speech act, so と introduces what the government said was being banned. ~型 (-kata) attached to a year is the standard way to designate car model years in Japanese: 1998年型 ('1998 model-year').