。
Could you make a clearer statement?
Literal
Clear [possessive-の] statement [object-を] do-[humble-receive-いただけ]-can [question-か].
明瞭 ('clear, lucid') is a formal/written na-adjective, more elevated than 明らか or わかりやすい. 陳述 ('statement, deposition') is specifically legal/formal vocabulary for a written or oral declaration. Together with the polite ~ていただけませんか ('could you please X?'), the sentence is the kind of thing a lawyer might say in cross-examination.