1. Many different animals can be found in the forest. --- simple sentence
2. The ball, smashing against the bat, made quite a noise. -- I think this is simple..but I am not 100% sure.
3. Before our first class, we sat down and had a nice breakfast. -- this is a complex sentence
4. After the snowstorm, we were finally able to leave the cabin. -- this is a complex sentence
5. I am aware of the error. -- (I wouldn't even change this) -- simple sentence.
6. We all sat around the campfire and sang " When the Saints Go Marching In . " -- I believe this is simple
7. I found myself between a rock and a hard place. -- I am thinking simple
8. Broken shards of glass cut my feet to pieces. -- simple
9. She looked perfect in the picture because of her beautiful smile. -- not sure if this is complex or simple.
10. Because she smiles at him, he got the impression that she liked him. -- complex sentence...I think