Complex sentence: There have been four known crashes of the J-10 to date, the first crash was of a prototype combat aircraft during testing in 1998 with the most likely cause cited as failure of the fly-by-wire flight control system.
Split into simpler sentences: There have been four known crashes of the J-10 to date. The first crash was of a prototype combat aircraft during testing in 1998 with the most likely cause cited as failure of the fly-by-wire flight control system.