I am also not sure what is 'split shift'. Anyway, I append below some Sections from the Employment Act for your info. It is not easy to understand and I would suggest you visit the Labour Department and get a better picture.
"shift work" means work which by reason of its nature requires to be carried on continuously or continually, as the case may be, by two or more shifts;
60C. Shift work.
(1) Notwithstanding section 60A(1)(b), © and (d), but subject to subsection (1)(a) thereof, an employee who is engaged under his contract of service in shift work may be required by his employer to work more than eight hours in any one day or more than forty eight hours in any one week but the average number of hours worked over any period of three weeks, or over any period exceeding three weeks as may be approved by the Director-General, shall not exceed forty-eight hours per week.
(1A) The approval of the Director-General in subsection (1) may be granted if the Director-General is satisfied that there are special circumstances pertaining to the business or undertaking of the employer which render it necessary or expedient for him to grant the permission subject to such conditions as he may deem fit to impose.
(1B) The Director-General may revoke the approval given under subsection (1A) at any time if he has reason to believe that it is expedient so to do.
(2) Except in the circumstances described in section 60A(2) (a), (b), (c), (d) and (e), no employer shall require any employee who is engaged under his contract of service in shift work to work for more than twelve hours in any one day.