Complex sentence: Throughout the books Bunter always takes care to address Wimsey as "My Lord"--nevertheless, he is obviously a friend as well as a servant, and Wimsey again and again expresses amazement at Bunter's high efficiency and competence at virtually every sphere of life.
Split into simpler sentences: Throughout the books Bunter always takes care to address Wimsey as "My Lord". Nevertheless, he is obviously a friend as well as a servant, and Wimsey again and again expresses amazement at Bunter's high efficiency and competence at virtually every sphere of life.