Complex sentence: Although Rudy was invented in 1960 by Freeman to demonstrate mechanical memory, Leachim was a 6 feet 200 pound robot conceived by Freeman in 1974 to show and to demonstrate that rudimentary computers could branch quickly enough to replicated speech (i.e. verbal output).
Split into simpler sentences: Although Rudy was invented in 1960 by Freeman to demonstrate mechanical memory. In 1974, Leachim a 6 feet 200 pound robot was conceived by Freeman to show and to demonstrate that rudimentary computers could branch quickly enough to replicated speech (i.e. verbal output).