Complex sentence: Pipefishes, like their seahorse relatives, leave most of the parenting duties to the male, which provides all of the postzygotic care for its offspring, supplying them with nutrients and oxygen through a placenta-like connection.
Split into simpler sentences: Pipefishes, like their seahorse relatives, leave most of the parenting duties to the male. The male pipefish provides all of the postzygotic care for its offspring, supplying them with nutrients and oxygen through a placenta-like connection.