Complex sentence: They also appear in "Pokémon Pinball" as a part of the "Blue field", and a as a miniature one who sits in the left pocket as part of the process of evolving a Pokémon that the player has caught.
Split into simpler sentences: They also appear in "Pokémon Pinball" as a part of the "Blue field", and a as a miniature one who sits in the left pocket. It is part of the process of evolving a Pokémon that the player has caught.