Complex sentence: Also there are countries where in a part of the territory English became a co-official language, e.g. Colombia's San Andrés y Providencia and Nicaragua's Mosquito Coast, due to the influence of British colonisation in the area.
Split into simpler sentences: Also there are countries where in a part of the territory English became a co-official language, e.g. Colombia's San Andrés y Providencia and Nicaragua's Mosquito Coast. This was a result of the influence of British colonisation in the area.