Complex sentence: The following year Betis returned to the top flight and ushered in a period of "good times" for the club with the next three seasons seeing three top-six finishes, and UEFA Cup qualification in 1982 and 1984.
Split into simpler sentences: The following year Betis quickly returned to the top flight and a period of "good times" for the club. The next three seasons saw three top-six finishes, and UEFA Cup qualification in 1982 and 1984.