Complex sentence: The East India Co. thought that this project would take about 5 years but it ended up taking more than 60 years, draining the profits of the Company, so much so it was brought under the Crown after 1857.
Split into simpler sentences: The East India Co. thought that this project would take about 5 years but it ended up taking more than 60 years, draining the profits of the Company. So much so it was brought under the Crown after 1857.