Complex sentence: Kepler used Tycho's records of the motion of Mars to deduce laws of planetary motion., enabling calculation of astronomical tables with unprecedented accuracy (the "Rudolphine Tables") According to and these tables were some 30 times more accurate than other astronomical tables then available.
Split into simpler sentences: Kepler used Tycho's records of the motion of Mars to deduce laws of planetary motion. Kepler's application of these two laws to obtain astronomical tables of unprecedented accuracy (the "Rudolphine Tables") According to and these tables were some 30 times more accurate than other astronomical tables then available.