Complex sentence: The didines are often separated as a distinct family Raphidae, and their affinities were for long uncertain; they were initially placed within the ratites due to their peculiar, flightlessness-related apomorphies, and a relationship to the Rallidae has also been suggested.
Split into simpler sentences: The didines are often separated as a distinct family Raphidae, and their affinities were for long uncertain. They were initially placed in the ratites due to their peculiar, flightlessness-related apomorphies, and a relationship to the Rallidae has also been suggested.