Primary research reports contain original research and they

Question

Type of sentence? Simple, compound, complex, compound-complex?

1. The pilots dead-sticked the King Air to the ramp, through a fence, over a berm, and into a pond.
2. Primary research reports contain original research, and they reflect research from a laboratory or in the field.
3. Two-way radio communications are not required; although, it is a good operating practice for pilots to monitor other aircraft on the specified frequency for the benefit of other traffic in the area.