Sure! Here’s how to categorize the sentences and join them:

1. **Alternative medicine treats the symptoms of a disease. Conventional medicine treats the underlying cause of a disorder.**
- **Point Type:** Contrasting
- **Joined Sentence:** Conventional medicine treats the underlying cause of a disorder; on the other hand, alternative medicine treats the symptoms of a disease.

2. **Alternative medicine makes use of natural products rather than drugs. Alternative medicines are not tested on animals.**
- **Point Type:** Additional
- **Joined Sentence:** Alternative medicine makes use of natural products rather than drugs; furthermore, alternative medicines are not tested on animals.

3. **Conventional doctors have recognizable and respected qualifications. Alternative medicine practitioners may not have formal qualifications.**
- **Point Type:** Contrasting
- **Joined Sentence:** Conventional doctors have recognizable and respected qualifications; however, alternative medicine practitioners may not have formal qualifications.

4. **People receiving conventional treatments often experience side effects. Alternative treatments can also cause side effects.**
- **Point Type:** Additional
- **Joined Sentence:** People receiving conventional treatments often experience side effects; in addition to this, alternative treatments can also cause side effects.

If you have more examples or need further help, feel free to ask!