Complex sentence: The first AM voice transmission was made by Canadian researcher Reginald Fessendon on 23 December, 1900 using a spark gap transmitter Fessendon is a major figure in the development of AM radio.
Split into simpler sentences: The first AM voice transmission was made by Canadian researcher Reginald Fessenden on 23 December 1900, using a spark gap transmitter. Fessenden is a major figure in the development of AM radio.