Complex sentence: The son, who signed his name "M. Allerdale Grainger", appears to have followed his father in his preoccupation with Chinese immigration; the Westminster Gazette published an article on the subject that in tone and content could have been written by his father.
Split into simpler sentences: The son, who signed himself as M. Allerdale Grainger appears to have followed his father in his preoccupation with Chinese immigration. The Westminster Gazette published an article on the subject that in tone and content could have been written by his father.