Complex sentence: Sjögren-Larsson syndrome (or Rud's syndrome) is a form of ichthyosis associated with a deficiency of the enzyme "fatty aldehyde dehydrogenase".
Split into simpler sentences: Sjögren-Larsson syndrome (or Rud's syndrome) is a form of ichthyosis. It is associated with a deficiency of the enzyme "fatty aldehyde dehydrogenase".