Complex sentence: A more likely designer of Cloverdale was the English landscape architect Joseph Forsyth Johnson, who emigrated to America in the 1870s after a successful career designing the grounds for a number of estates in England, Ireland and Russia.
Split into simpler sentences: A more likely designer of Cloverdale was the English landscape architect, Joseph Forsyth Johnson. Mr. Johnson emigrated to America in the 1870s after a successful career designing the grounds for a number of estates in England, Ireland and Russia.