Complex sentence: The mesoderm is also believed to be responsible for the formation of the central nervous system, for example the notochord is responsible for releasing certain factors which induce the ectoderm to become neural tissue.
Split into simpler sentences: The mesoderm is also believed to be responsible for the formation of the central nervous system. For example, the notochord is responsible for releasing certain factors which induce the ectoderm to become neural tissue.