Complex sentence: It was planned that there would be a layer of topsoil thick on the roof; small recreational spots with benches, connected by cobblestone paved paths were planned for the residents of an apartment house that was part of the same building.
Split into simpler sentences: It was planned that there would be a layer of topsoil thick on the roof. Small recreational spots with benches, connected by cobblestone paved paths were planned for the residents of an apartment house that was part of the same building.