Complex sentence: The earth has been in an interglacial period known as the Holocene for around 11,700 years, and an article in "Nature" in 2004 argues that it might be most analogous to a previous interglacial that lasted 28,000 years.
Split into simpler sentences: The earth has been in an interglacial period known as the Holocene for 11,700 years. For example, an article in "Nature" argues that the current interglacial might be most analogous to a previous interglacial that lasted 28,000 years.