Complex sentence: It has been suggested that he is the man portrayed in two Vermeer paintings of the late 1660s, "The Astronomer" and "The Geographer", however, others argue that there appears to be little physical similarity.
Split into simpler sentences: It has been suggested that he is the man portrayed in two of Vermeer's paintings of the late 1660s, "The Astronomer" and "The Geographer". However, others argue that there appears to be little physical similarity.