。
She is both a scholar and a poet.
Literal
She [topic-は] scholar [also-でもあり] poet [also-でもある].
~でもあり~でもある ('is both X and Y') is a formal, slightly literary construction for asserting that the same subject fills two roles. でもあり is the conjunctive (continuative) form of でもある, leaving the sentence open to continue; でもある then closes it. The pattern stacks も ('also') inside the copula で~ある, layering 'X-also Y-also.' This formula carries an even, balanced rhythm — used in obituaries, profiles, and biographical introductions, where naming multiple roles is the rhetorical point. The two roles are weighted equally, neither subordinated to the other.