Complex sentence: The post-war period generated an increase of wealth and brought closer European integration; as a part of the UN peacekeeping mission in the Balkans in the 1990s, Denmark abandoned its neutrality by participating in military engagements in the Middle East at the turn of the 21st century.
Split into simpler sentences: The post-war period generated an increase of wealth and brought closer European integration; as a part of the UN peacekeeping mission in the Balkans in the 1990s. More recently, it has participated in military engagements in the Middle East at the turn of the 21st century.