{C : Type u_1} →
  [inst : CategoryTheory.Category.{v_1, u_1} C] →
    {motive : SimplicialObject.Split C → Sort u} →
      ((X : CategoryTheory.SimplicialObject C) → (s : SimplicialObject.Splitting X) → motive { X := X, s := s }) →
        (t : SimplicialObject.Split C) → motive t