Complex sentence: A pome is an accessory fruit composed of five or more carpels in which the "exocarp" forms an inconspicuous layer, the "mesocarp" is fleshy, and the "endocarp" forms a leathery case around the seed.
Split into simpler sentences: A pome is an accessory fruit composed of five or more carpels in which the exocarp forms an inconspicuous layer. The mesocarp is usually fleshy, and the endocarp forms a leathery case around the seed.