Complex sentence: She was first introduced in "King Ottokar's Sceptre" and seems to constantly be popping up wherever Haddock goes, along with her maid Irma and pianist Igor Wagner.
Split into simpler sentences: She was first introduced in "King Ottokar's Sceptre". She seems to constantly be popping up wherever Haddock goes, along with her maid Irma and pianist Igor Wagner.