Original: In the course of the population growth Marzahn was separated from Lichtenberg in 1979 to become a borough in its own right and in 1986 the new Hellersdorf district (including Kaulsdorf and Mahlsdorf) was split from it.
Simplified: In 1979 the large housing estate of Marzahn was separated from Lichtenberg to become an East Berlin borough in its own right and in 1986 the new Hellersdorf district (including Kaulsdorf and Mahlsdorf) was split from it.