Simplify the following text for a Grade 10 native English-speaking person.
Original: After eleven years as a District Councillor he stood for the Berlin House of Deputies ( Abgeordnetenhaus von Berlin ) which serves as the City 's Landtag or state legislature in 1995 .
Simplified: After eleven years he stood for the Berlin House of Deputies Abgeordnetenhaus which is City 's Landtag or state legislature in 1995 .