Complex sentence: His death was caused by a time bomb hidden in his mattress; the bomb was placed by Soviet partisan Yelena Mazanik (1914-1996), a Belarusian woman who had managed to find employment in Kube's household as a maid in order to assassinate him.
Split into simpler sentences: His death was caused by a time bomb hidden in his mattress. According to one version of the plot, the bomb was placed by Soviet partisan Yelena Mazanik (1914-1996), a Belarusian woman who had managed to find employment in Kube's household as a maid in order to assassinate him.