Complex sentence: The Eurasian or Great Bittern is 69--81 cm (24 "-34") in length, with a 100--130 cm wingspan, although their most distinctive feature is the males booming call in spring.
Split into simpler sentences: The Eurasian or Great Bittern is 69--81 cm (24 "-34") in length, with a 100--130 cm wingspan. Their most distinctive feature is the males booming call in spring.