Add punctuation to the following sentence: Ivar Fredholms parents were Ludvig Oscar Fredholm and Catharina Paulina Stenberg Ludvig Fredholm was a merchant who made his fortune replacing gas lamps with electric lamps
Ivar Fredholm's parents were Ludvig Oscar Fredholm and Catharina Paulina Stenberg. Ludvig Fredholm was a merchant who made his fortune replacing gas lamps with electric lamps.