Complex sentence: It is a four-stroke, spark ignition, two-cylinder air-cooled boxer engine, with a capacity of 1057 cc and power of about 10 kW at 2800 rpm.
Split into simpler sentences: It is a four-stroke spark ignition two-cylinder boxer engine cooled by onslaught air. The cylinders had capacity of 1057 cc and power of about 10 kW at 2800 rpm.