Complex sentence: Their excellent observation and recoding methods are evident in the Maya codices, unfortunately, a great crime against the Maya was committed by Diego de Landa when he burned several of these codices, now only a few remain.
Split into simpler sentences: Their excellent observation and recoding methods are evident in the Maya codices. Unfortunately, a great crime against the Maya was committed by Diego de Landa when he burned several of these codices, now only a few remain.