Simplify the following text for a Grade 8 native English-speaking person.
Original: From the three eldest and juristic trained members the senate elected annually the First Mayor of Hamburg ( German title : Erster BÃ 1\/4 rgermeister der Freien und Hansestadt Hamburg ) -- the presiding head -- and his deputy ( Second Mayor of the Free and Hanseatic city of Hamburg , German title : Zweiter BÃ 1\/4 rgermeister der Freien und Hansestadt Hamburg ) .
Simplified: The Erster BÃ 1\/4 rgermeister is Hamburg 's Minister President .