Complex sentence: The high-performance Yamaha XJ650 Maxim, introduced in 1980 was designed as a special, including an in-line four cylinder engine and shaft drive--the XJ Maxim series continued the success of the XS Specials.
Split into simpler sentences: The high-performance Yamaha XJ650 Maxim, introduced in 1980 was designed as a special, including an in-line four cylinder engine and shaft drive. The XJ Maxim series continued the success of the XS Specials.