Original: Sauber used Ferrari designed engines ( from 1997 to 2005 ) and gearboxes built by Sauber Petronas Engineering , a company founded for the sole purpose of building these engines , that were nearly identical to the ones used by Ferrari .
Simplified: Sauber used Ferrari designed engines from 1997 to 2005 . They were built by Sauber Petronas Engineering , a company founded for purpose of building these engines .