Complex sentence: Many fern fronds are initially coiled into a "fiddle-head" or "crozier" (see circinate vernation) although cycad and palm fronds do not have this type of vernation.
Split into simpler sentences: Many fern fronds are initially coiled into a "fiddle-head" or "crozier" (see circinate vernation). Cycad and palm fronds do not have this type of vernation.