In this case, the force that led to the development of the continental rift was the slab pull of the subducting oceanic part of the crustal plate.
(the force; led; to the development of the continental rift) (the force that led to the development of the continental rift; was; the slab pull of the subducting oceanic part of the crustal plate; L:In this case)
the force the force that led to the development of the continental rift
led was
to the development of the continental rift
the slab pull of the subducting oceanic part of the crustal plate L:In this case