Complex sentence: Because screening and assessing for CSE is a complex and time consuming procedure requiring several specialists of multiple fields, few cases of CSE are accurately diagnosed in the medical field which may, in part, be a reason for the syndrome's lack of recognition.
Split into simpler sentences: Because screening and assessing for CSE is a complex and time consuming procedure requiring several specialists of multiple fields, few cases of CSE are formally diagnosed in the medical field. This may, in part, be a reason for the syndrome's lack of recognition.