Complex sentence: Almost immediately, many British colonists and land speculators objected to the proclamation boundary, since there were already many settlements beyond the line (some of which had been temporarily evacuated during Pontiac's War), as well as many existing land claims yet to be settled.
Split into simpler sentences: Almost immediately, many British colonists and land speculators objected to the proclamation boundry. There were also already many settlements beyond the line (some of which had been temporarily evacuated during Pontiac's War), as well as many existing land claims yet to be settled.