Complex sentence: His paternal grandfather, an Englishman, settled in Germany and married a German lady; and their son, Charles Milner, practised as a physician in London and became later Reader in English at Tübingen University.
Split into simpler sentences: His paternal grandfather, an Englishman, settled in Germany and married a German woman. Their son, Charles Milner, practiced as a physician in London and later became Reader in English at Tübingen University.