Complex sentence: In the case of black hybrids, they are called midnight mollies, which are very popular due to their impressive dorsal fins, but require a bit more attention and have a somewhat decreased lifespan-though certainly not as much as the deformed breeds.
Split into simpler sentences: In the case of black hybrids, they are called midnight molly. These are very popular due to their impressive dorsal fins, but require a bit more attention and have a somewhat decreased lifespan-though certainly not as much as the deformed breeds.