Complex sentence: It is based on the seventh generation 1992 Mitsubishi Eterna and was initially fitted with Mitsubishi's 4G63 2.0-litre l4 engine, but was offered with the superior 177bhp 6A12 DOHC 2.0L V6 engine after 1999.
Split into simpler sentences: It is based on the seventh generation 1992 Mitsubishi Eterna and was fitted with Mitsubishi's 4G63 2.0-litre l4 engine. It was offered with the superior 177bhp 6A12 DOHC 2.0L V6 engine after 1999.