Complex sentence: In his book "Arca Noë", Kircher argued that after the flood new species were transformed as they moved into different environments, for example, when a deer moved into a colder climate, it became a reindeer.
Split into simpler sentences: In his book "Arca Noë", Kircher argued that after the flood new species were transformed as they moved into different environments. For example, he contended that when a deer moved into colder climates, it became a reindeer.