Complex sentence: Lenin was thwarted during the "July Days" and forced to flee to Finland, more troops were sent to Finland, the "Power Act" was overruled and with co-operation and demands of the Finnish conservatives the Finnish Parliament was dissolved and new elections announced.
Split into simpler sentences: Lenin was thwarted during the "July Days" and forced to flee to Finland. There, with the demands and co-operation of Finnish conservatives, the Finnish Parliament was dissolved and new elections announced.