Question

Combine the following sentences into one well-written sentence that contains all the ideas in these sentences. Use an appositive.

The invention of the scuba regulator made underwater exploration possible for the average vacationer. The scuba regulator is a device that allows a diver to breathe compressed air from a tank.

Answer 1

The combined sentence would be:
The invention of the scuba regulator, a device that allows a diver to breathe compressed air from a tank, made underwater exploration possible for the average vacationer.

The second sentence is used as an appositive to the noun it directly describes, which is the "scuba regulator".