Complex sentence: Growth of a fern frond differs from that of a leaf of a flowering plant; the fern frond unrolls from a tightly-coiled structure called a "fiddle-head" (see circinate vernation).
Split into simpler sentences: Growth of a fern frond differs from that of a leaf of a flowering plant. The fern frond unrolls from a tightly-coiled structure called a "fiddle-head" (see circinate vernation).