Complex sentence: Georg Hartung (around 1822-around 1891), a German pioneering brother of geology, author of multiple books about the great qualities about Macaronesia especially the Azores and the Canary Islands.
Split into simpler sentences: Georg Hartung (around 1822-around 1891), a German pioneering geologist. He is best known for several books and articles about the islands of Macaronesia, especially the Azores and the Canary Islands.