Complex sentence: Tokugawa Ieyasu centralized power in his shogunate between 1603 and 1615 and this marked the beginning of the Edo period which brought 250 years of relative stability to Japan, lasting until the second half of the 19th century.
Split into simpler sentences: Tokugawa Ieyasu centralized power in his shogunate between 1603 and 1615. This marked the beginning of the Edo period, which brought 250 years of relative stability to Japan, lasting until the second half of the 19th century.