Hello, Fairy! I will do my best to paraphrase your sentences for you.
1. A hospital administrator quit his job because he was accused of lying in order to get the job.
2. As air rises, it becomes colder and loses moisture.
3. The object is made from one wire (approximately 110 cm long) and can be formed into a flat oblong coil. Oblong is a shape similar to an oval. You can see images of a 'flat oblong coil' here: https://www.ecosia.org/images?q=flat+oblong+coil
4. Speaker 1 justifies her decision to choose a different major. (She will now be studying something different to obtain her college degree.)
I hope these sentences help! If you are interested in increasing your English fluency, I am a professional teacher on Italki. I would be happy to work with you.