Simplify the following text for a Grade 6 native English-speaking person.
Original: Friedrichshain-Kreuzberg is the second borough of Berlin , formed in 2001 by merging the former East Berlin borough of Friedrichshain and the former West Berlin borough of Kreuzberg .
Simplified: Friedrichshain-Kreuzberg is a borough of Berlin . It is a new borough , only made in 2001 by joining the old boroughs of Friedrichshain and Kreuzberg .