 Gorillas use this form of walking because their hips are attached differently than humans so standing on two legs for a long period of time would eventually become painful.
<fluency>  Gorillas use this form of walking because their hips are attached differently than humans so standing on two legs for a long period of time would eventually become painful.
 Gorillas use this form of walking because their hips are attached differently from humans, so standing on two legs for a long period of time would eventually become painful.