Complex sentence: Spirit Airlines had scheduled service to several Florida cities and Detroit, before they moved their New York business to LaGuardia Airport in 2001; in May 2008 the airline resumed service to Fort Lauderdale from MacArthur only to discontinue it shortly thereafter.
Split into simpler sentences: Spirit Airlines had scheduled service to several Florida cities and Detroit, before they moved their New York business to LaGuardia Airport in 2001. However, in May 2008, the airline resumed service to Fort Lauderdale from MacArthur Airport, only to discontinue it again shortly thereafter.