洗練された Englisch:

Modern finance is becoming increasingly complicated and sophisticated.

I felt utterly out of place among those sophisticated people.

sophisticated language

Even small provincial schools are buying sophisticated software for their computer rooms, some countries are introducing e-books instead of the good old paper textbooks.

it's a magazine for more sophisticated readers

It can fly more than 500 miles (805 kilometers)(...); armed versions can fire sophisticated missiles.

Mathematicians are creative artists, their artworks being sophisticated constructs of ideas and aesthetic proofs.

Fans of this kind of music tend to be quite sophisticated.

It's time to keep things casual but sophisticated.

The police used highly sophisticated surveillance equipment.

I suppose some rich people, some politicians or university teachers are sophisticated.

Computers are here to stay and they'll become more and more sophisticated, but we have to remember they are just tools.

I'm a simple farmer and I don't belong to this sophisticated company of celebrities.

It’s better to avoid sophisticated vocabulary unless you can use it properly.

The new equipment in the computer room is extremely sophisticated, so be careful when you use it!