He

👨

Pronoun

  chose

Verb

  the

Determiner

  subject

Noun

 'Radio  Astronomy

Proper noun

  and

Coordinating conjunction

  the

Determiner

  Structure

Proper noun

  of

Adposition

  the

Determiner

 Universe'.

He chose the subject 'Radio Astronomy and the Structure of the Universe'.

He chose the subject 'Radio Astronomy and the Structure of the Universe'.