Bechtolsheim left Sun in 1995 to found Granite Systems, a maker of high-speed networking systems, which he later sold to Cisco Systems.
Sun is a maker of high-speed networking systems.
it is incorrect because Granite Systems is the correct company. the words are all in the same sentence in the passage so the AI though it was correct.
( z1 company :name ( z2 name :op "Sun" ) :ARG0-of ( z3 make :ARG1 ( z4 system :mod ( z5 network :mod ( z6 speed :ARG1-of ( z7 high ) ) ) ) ) )