Complex sentence: In 1814 Johann Bernhard Logier patented his "chiroplast," an invention for holding the hands in a proper position while playing the pianoforte, and his system of teaching was ardently taken up by Eager.
Split into simpler sentences: In 1814 Johann Bernhard Logier patented his "chiroplast," an invention for holding the hands in a proper position while playing the pianoforte. This system of teaching was ardently taken up by Eager.