Complex sentence: The airport has undergone major modernization and expansion projects up to today and in 1988, NATO injected vast amounts of money to make the airfield be able to handle large air forces in the event of an emergency.
Split into simpler sentences: The airport has undergone major modernization and expansion projects up to the present day. In 1988 NATO injected vast amounts of money to enable the airfield to handle large air forces in the event of an emergency.