Complex sentence: He introduced a system of national militia in the place of foreign mercenaries, and during his government the long war with Pisa was brought to a close with the capture of that city by the Florentines in 1509.
Split into simpler sentences: He introduced a system of national militia in the place of foreign mercenaries. During his government the long war with Pisa was brought to a close with the capture of that city by the Florentines in 1509.