In Viewer and Aligner, choose File | Open, choose the language and select your plain text file.
and you may see this sort of thing in Sentence view,
or in Paragraph view,
Edit it, as necessary, e.g. splitting or merging paragraphs or sentences.
Save it as a .VWR file:
.
See also: example of aligning
Page url: http://www.lexically.net/downloads/version5/HTML/?viewer_reading_in_a_plain_text.htm