Complex sentence: It may seem tempting to plug in a single best estimate\\ hat for\\ theta, but this ignores uncertainty about\\ theta, and because a source of uncertainty is ignored, the predicted distribution will be too narrow.
Split into simpler sentences: It may seem tempting to plug in a single best estimate\\ hat for\\ theta, but this ignores uncertainty about\\ theta. Because a source of uncertainty is ignored, the predicted distribution will be too narrow.