Complex sentence: Niels Finsen was born in Tórshavn, Faroe Islands, as the 2nd oldest of four children of Hannes Steingrim Finsen who belonged to an Icelandic family with traditions reaching back to the 10th century, and Johanne Fröman, who was born and raised in Iceland.
Split into simpler sentences: Niels Finsen was born in Tórshavn, Faroe Islands, as the second-oldest of four children. His parents were Hannes Steingrim Finsen, who belonged to an Icelandic family with traditions reaching back to the 10th century, and Johanne Fröman, who was born and raised in Iceland.