Complex sentence: While some characters seem to be unreliable for the separation of each species, other characters, like the width of the broadest leaves, the shape of the perigynium base, and the fertile culms, are reliable.
Split into simpler sentences: While some characters seem to be unrelibale for the separation of each species. Other characters, like the width of the broadest leaves, the shape of the perigynium base, and the fertile culms, are reliable.