Complex sentence: Epigenetic factors including histone modifications, CpG island methylation and chromatin organization can cause the stable silencing or activation of particular genes, and this is important in differentiating tissues during development of the embryo.
Split into simpler sentences: Epigenetic factors including histone modifications, CpG island methylation and chromatin organization can cause the stable silencing or activation of particular genes. This is important in differentiating tissues during development of the embryo.