When I copy your test text and paste it into a Gmail message and to keep source formatting I get:
This is a sample. This is a sample. This is a sample. This is a sample. This is a sample. This isa sample. This is a sample.This is a sample.This is a sample.This is a sample.This is asample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This isa sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample. This is a sample. Thisis a sample. This is a sample. This is a sample. This isa sample. This is a sample.This is a sample.This is a sample.This is a sample.This is asample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This isa sample.This is a sample.This is a sample.This is a sample.This is a sample.This isa sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample. This is a sample. This is a sample. This is a sample. This is a sample. This isa sample. This is a sample.This is a sample.This is a sample.This is a sample.This is asample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is a sample.This is asample.This is a sample.This is a sample.This isa sample.This is a sample.This is a sample.This is a sample.This is a sample.
PS: But note your sample does not have any 'formatting' when pasted into a Word document. There are no formatting marks! (except there is a paragraph mark at the end of the document and there is the usual dot between each word.