Complex sentence: The Eurasian water shrew has a pair of glands under its jaw which produce venom, and this has been shown to be potent against the field vole ("Microtus agrestis"), and lethal at a minimum dose of fifteen milligrams per kilogram body weight.
Split into simpler sentences: The Eurasian water shrew has a pair of glands under its jaw that produce venom. This has been shown to be potent against the field vole ("Microtus agrestis"), and lethal at a minimum dose of fifteen milligrams per kilogram body weight.