Complex sentence: Abeba who was born in Ethiopia and represented the country in middle-distance until December 2012 when Abeba was eligible to represent Sweden in international competition and made her first race representing her new country at international level during the 2013 European Athletics Indoor Championships on 1 March.
Split into simpler sentences: Abeba who was born in Ethiopia and represented the country in middle-distance until December 2012 when Abeba was eligible to represent Sweden in international competition. Aregawi made her first race representing her new country at international level during the 2013 European Athletics Indoor Championships on 1 March.