Complex sentence: Initially five evolutionary stones were introduced into the game, including the Water, Thunder, Leaf, Moon and Fire stones, though Generation II saw the introduction of the Sun Stone, allowing Pokémon like Gloom to evolve into Bellossom and Sunkern into Sunflora.
Split into simpler sentences: Initially five evolutionary stones were introduced into the game, including the Water, Thunder, Leaf, Moon and Fire stones. Though Generation II saw the introduction of the Sun Stone, allowing Pokémon like Gloom to evolve into Bellossom and Sunkern into Sunflora.