Complex sentence: The star was catalogued by French explorer and astronomer Nicolas Louis de Lacaille in 1756 but not given a name--he gave the Bayer designation of "Pi Gruis" to Pi2 Gruis.
Split into simpler sentences: The star was catalogued by French explorer and astronomer Nicolas Louis de Lacaille in 1756 but not given a name. Instead, he gave the Bayer designation of "Pi Gruis" to Pi2 Gruis.