Complex sentence: Their route took them across the Orange River to Kuruman, where they met Robert Moffat, who had befriended Mzilikazi and was able to provide Harris with useful information about the ruler.
Split into simpler sentences: Their route took them across the Orange River to Kuruman. Here they met Robert Moffat, who had befriended Mzilikazi and was able to provide Harris with useful information about the ruler.