Dr de Vos and Dr Andersson found that, though the bacterial populations in the faeces of the seven treated infants initially resembled those found in the faeces of the untreated Caesarean-born infants(由连词 though 引导的让步状语从句), this quickly changed.(主句)
黑体部分为 found 的宾语从句。
though the bacterial populations(主语) in the faeces of the seven treated infants initially (定语)resembled (谓语动词)those (宾语)found in the faeces of the untreated Caesarean-born infants(定语), this quickly changed.(主句)