Complex sentence: Whereas later settlement would be through the purchase of land from the Native Americans, the Dutch built Fort Orange without any consent and continued to hold it only through the goodwill of the Mahicans and the occasional presents that they gave to the local Mahicans.
Split into simpler sentences: Whereas later settlement would be through the purchase of land from the Native Americans, the Dutch built Fort Orange without any consent. They continued to hold it only through the goodwill of the Mahican, and the occasional presents that they gave to the local Mahicans.