Complex sentence: But the suppression of the Satsuma Rebellion brought upon him the personal revenge of Saigo's sympathizers, and in the spring of 1878 he was assassinated by Shimada Ichiro and six of his fellows on the way to Tokyo in 1878.
Split into simpler sentences: But the suppression of the Satsuma Rebellion brought upon him the personal revenge of Saigo's sympathizers, and in the spring of 1878 he was assassinated by six clansmen. He was assassinated by Shimada Ichiro and his fellows on his way to Tokyo in 1878.