Complex sentence: They are generally monogamous, although cooperative breeding has been observed in some species and is quite common in others, for example the laughing kookaburra, where helpers aid the dominant breeding pair in raising the young.
Split into simpler sentences: They are generally monogamous, although cooperative breeding has been observed in some species. In a few species cooperative breeding is quite common, for example the laughing kookaburra, where helpers aid the dominant breeding pair in raising the young.