Complex sentence: The star iPTF14hls was discovered in September 2014 by the Intermediate Palomar Transient Factory, and astronomers identified it as an exploding star in January 2015.
Split into simpler sentences: The star iPTF14hls was discovered in September 2014 by the Intermediate Palomar Transient Factory. Based on that information it was confirmed as an exploding star in January 2015.