Complex sentence: C-banding is a staining technique that can be used to visualize dicentric chromosomes, and is highly effective because this technique stains constitutive heterochromatin, which are regions of the chromosome at the centromere.
Split into simpler sentences: C-banding is a staining technique that can be used to visualize dicentric chromosomes. It specifically stains constitutive heterochromatin, which are regions of the chromosome at or near the centromere.