An Epic Journey

A research team proceeded towards the apex of a natural geologic protuberance, the purpose of their expedition being the procurement of a sample of fluid hydride of oxygen in a large vessel, the exact size of which was unspecified. One member of the team precipitously descended, sustaining severe damage to the upper cranial portion of his anatomical structure; subsequently the second member of the team performed a self-rotational translation oriented in the same direction taken by the first team member. 

In simple English what does this translate to??

Jack and Jill went up the hill...