Complex sentence: When Yashwant Rao became incapable of managing his affairs, his minister Bala Ram Seth was entrusted with the administration of the State, but he was entirely under the influence of Tulsi Bai Holkar, a mistress of the ruler.
Split into simpler sentences: When Yashwant Rao became incapable of managing his affairs, his minister Bala Ram Seth was entrusted with the administration of the State. But the minister was entirely under the influence of Tulsi Bai Holkar, a mistress of the ruler.