Complex sentence: His attitude towards the British was humane and even kindly: he even generously defended Horatio Gates, who had repeatedly intrigued against him, when Gates' conduct of the campaign in the South was criticized.
Split into simpler sentences: His attitude towards the British was humane and even kindly. He even generously defended Horatio Gates, who had repeatedly intrigued against him, when Gates' conduct of the campaign in the South was criticized.