What is the main clause of this sentence?

The Baltic languages are part of the Indo-European language family and are mainly spoken in countries around the Baltic Sea.

His efforts finally brought about a spectacular result.

Her character, with its dignified and resolute nature, is charming.

He is interested in astronomy, especially in studying Draco.

My new rice cooker is very convenient.

My hobby is playing musical instruments.

The shock absorbers of this car have been replaced with new ones.

Fish use their respiratory organs to take in oxygen underwater.

He truly embodies the saying, 'A gentleman is no specialist.'