もっとゆっくり話していただけませんか。

(some) more; even more; longer; further

slowly; at ease; restful

to talk; to speak; to converse; to chat; to tell; to explain; to narrate; to mention; to describe; to discuss; to speak (a language)

only; just; merely; simply; no more than; nothing but; alone; as (e.g. as soon as, as much as); worth

indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way