Complex sentence: One of those states that decreasing in sea ice makes the colony of emperor penguins shrinks because they need ice for their breeding process, and other species of penguin, such as Adelie, chinstrap, and gentoo is also influenced by decreasing in sea ice.
Split into simpler sentences: One of those states that decreases in sea ice makes the colony of emperor penguins shrink because they need ice for their breeding process. Other species of penguin, such as Adelie, chinstrap, and gentoo are also influenced by decreasing sea ice.