Complex sentence: DNA methylation is typically removed during zygote formation and re-established through successive cell divisions during development although the latest research shows that hydroxylation of methyl group occurs rather than complete removal of methyl groups in zygote.
Split into simpler sentences: DNA methylation is typically removed during zygote formation and re-established through successive cell divisions during development. However, the latest research shows that hydroxylation of methyl group occurs rather than complete removal of methyl groups in zygote.