Complex sentence: During the night of 24/25 October 1998 Alitalia moved the majority of its fleet from Rome-Fiumicino--where it had flown from for over 50 years--to Malpensa Airport, which then started a new lease of life as the Italian flag carrier's main hub.
Split into simpler sentences: During the night of 24/25 October 1998 Alitalia moved the majority of its fleet from Rome Fiumicino Airport--where it had been flying from for over 50 years--to Malpensa Airport. The airport started a new lease of life as the Italian flag-carrier's main hub.