Complex sentence: Printing was not dominated by the shogunate at this point, however; private printers appeared in Kyoto at the beginning of the 17th century, and Toyotomi Hideyori, Ieyasu's primary political opponent, aided in the development and spread of the medium as well.
Split into simpler sentences: Printing was not dominated by the shogunate at this point, however. Private printers appeared in Kyoto at the beginning of the 17th century, and Toyotomi Hideyori, Ieyasu's primary political opponent, aided in the development and spread of the medium as well.