Complex sentence: Also for 1971, the SC/360 was added, an 8-cylinder performance vehicle available only as a two-door coupe (The tire pressure sticker on the first 1970 models hinted at the SC/360).
Split into simpler sentences: Also for 1971, the SC/360 was added. This was a V8 performance vehicle available only as a two-door coupe (The tire pressure sticker on the first 1970 models hinted at the SC/360).