Complex sentence: Milloy noted that Banneker had recorded in a journal published around 1800 that the "locusts" had appeared in 1749,1766 and 1783 and had predicted that the insects would return in 1800.
Split into simpler sentences: Milloy noted that Banneker had recorded in a journal published around 1800 that the "locusts" had appeared in 1749,1766 and 1783. Milloy further noted that Banneker had predicted that the insects would return in 1800.