Task: Text Simplification
Input (English): In accordance with the order of succession in the Nigerian constitution following President Umaru Yar 'Adua 's death on 5 May 2010 , acting President Goodluck Jonathan was sworn in as the substantive President of the Federal Republic of Nigeria on 6 May 2010 , becoming Nigeria 's 14th Head of State .
Output (English): Jonathan was sworn in as Yar 'Adua 's replacement on 6 May 2010 , becoming Nigeria 's 14th Head of State .