Complex sentence: These body markings tend to be a paler brown/cream in colour on top of the often dark, chocolate-brown base tones, these markings normally fade after 2/3's of the body until only the base colour remains but there are exceptions to the rule.
Split into simpler sentences: These body markings tend to be a paler brown/cream in colour on top of the often dark, chocolate-brown base tones. These markings normally fade two-thirds of the way down the body until only the base colour remains, but there are exceptions to the rule.