Complex sentence: Ramakrishna asked Narendranath (pre-monastic name of Swami Vivekananda) to sing and impressed by his singing talent, he invited him to Dakshineswar.
Split into simpler sentences: Ramakrishna asked Narendranath (the pre-monastic name of Swami Vivekananda) to sing. Impressed by his singing talent, he invited him to Dakshineswar.