Buffalo can buffalo Buffalo buffalo, but don’t do it too much. – grade 5
Buffalo can buffalo Buffalo buffalo. – grade 10 (obviously much harder to parse)

A corpuscle is an outmoded idea from the early modern period. Modern science eschews such terms in favor of atomism. – grade 6

Did a mote perchance alight upon your nape ere your sojourn? – grade 5

Schadenfreude beckons: would that I were able to resist it. But its force, an animal magnetism of sorts, calls me. I must yield. – Grade 3