Simplify the following text for a Grade 10 native English-speaking person.
Original: On 5 May 2008 , he received his first call-up for the Croatian national team at senior level , being added to their 23-man squad for the UEFA Euro 2008 finals in Austria and Switzerland .
Simplified: On 5 May 2008he became member of the team for the UEFA Euro 2008 finals in Austria and Switzerland , where he only played in the last group match against Poland .