Complex sentence: The minichromosomes are also amplified to produce a high variable copy number between the minichromosomes, so minichromosome A may have 500 copies while minichromosome B only has 5 copies in the somatic chromosome.
Split into simpler sentences: The minichromosomes are also amplified to produce a high variable copy number between the minichromosomes. For example, minichromosome A may have 500 copies while minichromosome B only has 5 copies in the somatic chromosome.