Complex sentence: POWER8 comes in two variants, one 6-core and one 12-core version; each variant is fabricated in a 22 nm silicon on insulator (SOI) process using 15 metal layers.
Split into simpler sentences: POWER8 comes in two flavors, one 6-core and one 12-core version. Each are fabricated by a 22 nm silicon on insulator (SOI) process using 15 metal layers.