Complex sentence: Admirers view him as a champion of working people's rights and welfare whilst critics seem him as dictator who carried out mass human rights abuses: one of his biographers Robert Service, says he, laid the foundations of dictatorship and lawlessness.
Split into simpler sentences: Admirers view him as a champion of working people's rights and welfare. However, others disagree: one of his biographers Robert Service, says he, laid the foundations of dictatorship and lawlessness.