。
Mr. Suzuki is a great scientist.
Literal
Suzuki-Mister [topic-は] great scientist [copula-だ].
氏 (し) is a formal/written title, roughly 'Mr./Ms.' but more formal than さん — common in news, academic writing, and formal introductions. Distinct from 先生 (used for teachers, doctors, and other accomplished professionals) and the everyday さん.