Complex sentence: This kind of evaluation ignores historical background and the evidence that was available at a particular time: did Aristarchus have evidence to support his idea that the Sun was at the center; were there good reasons to reject Ptolemy's system before the Sixteenth Century ?
Split into simpler sentences: This kind of evaluation ignores the evidence that was available at a particular time. Did Aristarchus have evidence to support his idea that the Sun was at the center; were there good reasons to reject Ptolemy's system before the Sixteenth Century?