Complex sentence: In chemistry, and in particular, in organometallic chemistry, the prototypical metallocene is ferrocene, consisting of two cyclopentadienyl rings bound on opposite sides of a central iron atom, forming an "organometallic sandwich compound".
Split into simpler sentences: In chemistry, and in particular, in organometallic chemistry, a metallocene is a coumpound consisting of an aromatic organic ligand bound to a metal. The prototypical metallocene is ferrocene, consisting of two cyclopentadienyl rings bound on opposite sides of a central iron atom, forming an "organometallic sandwich compound".