Complex sentence: In 1925 Pipkin produced an acid etching invention process for the inside of the bulb of an electric lamp that did not weaken the glass and left the outside of the bulb globe smooth.
Split into simpler sentences: In 1925 Pipkin produced an acid etching invention process for the inside of the bulb of an electric lamp that did not weaken the glass. It left the outside of the bulb globe smooth.