If you have two different sentences from a source in a row, do you need to cite both?

Yes you must cite both because it would be plagiarism if you dont

It is fine to add the in text citation at the end of the paragraph. If the sentences are referring to different pages from the source you may want to cite them separately.

Also, check out the Purdue Owl website. It has everything you need to know about citations and other useful writing information!