Joining 
The easiest way to join two sentences is simply to drag the one you want to move onto its neighbour above. Or you can mark them with 
, then press . You will be told if you're in danger of jumbling up your text!
Splitting in two 
To split a sentence, press . You will get a list of the words. Click on the word which should end the sentence, then press OK.
example
"It
is
good!"
Mary
wanted
more.
This will insert the following words (Mary wanted more.) into a new line below.
See also: Viewer contents