Complex sentence: The 1992--93 season was Sport Lisboa e Benfica's 89th season in existence and the club's 59th consecutive season in the top flight of Portuguese football, covering a the period from 1 July 1992 to 30 June 1993.
Split into simpler sentences: The 1992--93 season was Sport Lisboa e Benfica's 89th season in existence and the club's 59th consecutive season in the top flight of Portuguese football. It covers the period from 1 July 1992 to 30 June 1993.