I have some sentences in a paragraph and have a picture (an illustration for
it). what I'd like to do is insert a picture e.g. in the center of the page
and have the sentences from the paragraph sourround it. (not like 1
sentence, then comes the picture, and the second line comes from far behind
the bottom of the picture.)
You are asking to flow content (your sentences) into a non-rectangular
structure (the text box with the hole in it to accommodate the
picture). Though it has four edges, the hole inside doesn't make it a
simple rectangle.