we use a free app called SPLICE, it's for a go pro but works great for iPhone videos
IPhone 6 Video
The Videoshop app is a good free video editing tool. Great if you need to lighten up, cut , rotate, etc.
We filmed a video at a recent party with all participants agreement. It runs about 60 minutes. We would like to make four 15 minute videos. Any suggestions on how to do this?