Final answer:
Combining two ideas into a single sentence, one could say, 'It's hard to believe these masterpieces originate from plain white tops, yet each one is a testament to the artist's creativity and skill.'
Step-by-step explanation:
The task of combining two ideas into a single sentence can be achieved by using a compound or complex sentence structure. For the sentence 'It's hard to believe these masterpieces originate from plain white tops', we could integrate another idea that complements or contrasts with the first idea to create a single, coherent sentence.
For example, you could say: 'It's hard to believe these masterpieces originate from plain white tops, yet each one is a testament to the artist's creativity and skill.'