Complex sentence: However, with the presence of these null alleles, the results may have been slightly biased, or they may be related to a particularity of the "C. undulatus", which are highly restricted to coral reef habitats.
Split into simpler sentences: However, with the presence of these null alleles, the results may have been slightly biased. Or they may be related to a particularity of the "C. undulatus" which are highly restricted to coral reef habitats.