Final answer:
To combine the given sentences, use the conjunction 'but' to show a contrast between the difficulty of glazing pottery and the stunning results.
Step-by-step explanation:
The best way to combine the given sentences is by using the conjunction 'but'. This will show a contrast between the difficulty of glazing pottery and the stunning results that make the effort worthwhile. The combined sentence would be: 'Glazing pottery can be tricky, but the stunning results make the effort worthwhile.'
Learn more about Combining sentences with conjunctions