Falling Upwards

title thanks to brett, here's a sentence from my narrative that you all should critique cause I'm not quite sure how to make it sound better.

It wasn't until a few seconds later I realized that intertwined in between the bent in half ladder in the grass layed my dad with the whole left side of his body almost completely covered in blood. His arm had been cut open from his elbow up to almost his wrist. I was starting to tear up. It was my dad's calmness that kept me under control.

My question is first, do you think the part describing his arm is neccessary or just cut the whole sentence out? And more importantly now, the last three sentences very chunked, how do you think I could put them together and/or make that section smoother? I guess I feel that the voice in this section is a little off and it just doesn't flow.