One Word Sentences

Hello, newby here, I've been doing a lot of research lately which involves cutting and pasting
paragraphs from online articles, books etc. I'm trying to collate the information into m/word
documents, sometimes it works perfectly but then I get just one or two words per line and have
to ''reconstruct'' the text into complete sentences; which is time consuming and frustrating.
Does anyone know why this happens and how to mend the problem? Thanks in advance.