Complex sentence: In 1913 William Stanley Jr. created the Stanley bottle as a result of his work with transformers, during which he discovered that a welding process he was using could be used to insulate a vacuum bottle with steel instead of glass.
Split into simpler sentences: In 1913 William Stanley Jr. creates the Stanley Bottle as a result of his work with transformers. During this work he discovered that a welding process he was using could be used to insulate a vacuum bottle with steel instead of glass.