Complex sentence: Petr Pravec (born September 17,1967) is a Czech astronomer, born in Třinec, a prolific discoverer of binary asteroids using lightcurve photometric studies.
Split into simpler sentences: Petr Pravec (born September 17,1967) is a Czech astronomer. He was born in Třinec, Czech Republic Pravec is a prolific discoverer of binary asteroids using lightcurve photometric studies.