。
Mr. Suzuki is an expert in history.
Literal
Suzuki-teacher [topic-は] history [of-の] expert [copula-です].
A simple nominal predication. 先生 is the standard polite title for teachers, doctors, and some professionals; translates broadly as 'Mr./Ms. [Name]' in English depending on context. 専門家 ('specialist, expert') is from 専門 ('specialty, expertise') + 家 ('person, house' — here a suffix for specialists like 芸術家 'artist,' 作家 'writer').