Complex sentence: Currently, the most popular explanation for Haldane's rule is the composite hypothesis, which divides Haldane's rule into multiple subdivisions, including sterility, inviability, male heterogamety, and female heterogamety.
Split into simpler sentences: Currently, the most popular explanation for Haldane's rule is the composite hypothesis. The composite hypothesis divides Haldane's rule into multiple subdivisions, including sterility, inviability, male heterogamety and female heterogamety.