Yikes! That is difficult! Here's one I loved as a child:
Esau Wood sawed wood. Esau Wood would saw wood. Oh, the wood Esau Wood would saw. All the wood Wood saw, Esau sought to saw. One day Wood's woodsaw would saw no wood. Hence, all the wood Wood would saw was not the wood Wood would saw, since Wood's woodsaw would saw no wood. Now Wood would saw wood with a woodsaw that would saw wood, so Esau sought a saw that would saw wood. One day Esau saw a saw saw as no other woodsaw would saw. In fact, of all the woodsaws Wood ever saw saw wood, Wood never saw a saw saw as the woodsaw Wood saw would saw. And I never saw a saw saw as the woodsaw Wood saw would saw, until I saw Esau saw wood with the woodsaw Wood saw saw wood. Now Wood saws wood with the woodsaw Wood saw saw wood.