Simplify the following text for a Grade 8 native English-speaking person.
Original: ; U3\/U6 : Upgrade of Marienplatz station The increase in traffic and the new Allianz Arena also required a larger capacity of this central transfer station .
Simplified: ; U3\/U6 : Upgrade of Marienplatz Station . Because of more passengers and the new Allianz Arena also this station was extended .