Complex sentence: Work on the former brought led to his acquaintance with the mosquito expert Frederick Wallace Edwards, whom he accompanied on the 1934-1935 expedition to the Rwenzori Mountains, sponsored by British Museum (Natural History).
Split into simpler sentences: Work on the former brought led to his acquaintance with the mosquito expert Frederick Wallace Edwards. Gibbins accompanied Edwards on the 1934-1935 expedition to the Rwenzori Mountains, sponsored by British Museum (Natural History).