Complex sentence: There are 20 known human disorders related to dynamic mutations so far, majority of these disorders are autosomal dominant and involve expansion of trinucleotide repeats, however diseases with tetranucleotide and pentanucleotide repeat expansion have also been seen.
Split into simpler sentences: There are 20 known human disorders related to dynamic mutations so far, majority of these disorders are autosomal dominant and involve expansion of trinucleotide repeats. However, recessive or X-linked disorders and tetranucleotide and pentanucleotide repeat expansion have also been seen.