Complex sentence: For example, in the Homininae, two chromosomes fused to produce human chromosome 2; this fusion did not occur in the lineage of the other apes, and they retain these separate chromosomes.
Split into simpler sentences: For example, in the Homininae, two chromosomes fused together to produce human chromosome 2. This fusion did not occur in the lineage of the other apes, and consequently they retain these separate chromosomes.