Very, cool. Type your paragraph in Motion. Select the group that defaulted with the text. Create a mask around the first part of the paragraph you want. I used the Bezier Mask Tool. Add a Fade in/Fade out behavior. Duplicate the group. (Command and D keys) Select the mask layer in the other group and open the Mask tab in the inspector. Check the Invert Mask check box so the other part of the paragraph is visible. Move it down the time line so it dissolve in later in the animation and that should do it. If you would still like the project file let me know. Best of luck.
Stephen Smith
Salt Lake Video
Check out my DVD Money Making Graphics & Effects for Final Cut Studio 2