Complex sentence: In 1935/36 the original plans for extending the cemetery were dropped and the land was appropriated for landscaping related to the 1936 Summer Olympics; the fact that the non-denominational cemetery contained a number of Jewish graves bolstered the Nazis' need to keep the cemetery out of sight.
Split into simpler sentences: In 1935/36 the original plans for extending the cemetery were dropped and the land was instead taken over for landscaping related to 1936 Summer Olympics. The fact that the inter-confessional cemetery contained a number of Jewish graves bolstered the Nazis' idea of keeping the cemetery out of sight.