Here are the combined sentences based on the prompts provided:

1. Mr. Pike teaches history of arts, while Mrs. May teaches a different subject.
2. This bike is different in price from that bike, as it is 800,000 VND compared to 600,000 VND.
3. My house is different from your house; it is small and old, while yours is spacious and modern.
4. Classical music is interesting, and folk music is interesting as well.
5. Mr. Owen and Mrs. Phan speak the same language, which is English.
6. Huyen My sings beautifully, and her sister sings more beautifully than her.
7. The new sculpture is 4 metres high, while the old sculpture is 4.2 metres high, as both sculptures are tall.
8. My sister's hair is different from my hair; hers is long and wavy, while mine is short and straight.
9. Van Gogh is Dutch, while Picasso is Spanish, and their nationalities are different.
10. This house is green, while that house is yellow, so their colors are different.