Complex sentence: Examination of its engines indicated excessive engine wear, with engine pistons welded to their sleeves, apparently traced to improper installation of piston rings and/or installation of incorrect (chromed vs. plain) rings.
Split into simpler sentences: Examination of its engines indicated excessive engine wear, with engine pistons welded to their sleeves. A root cause analysis apparently traced the problem to improper installation of piston rings and/or installation of incorrect (chromed vs. plain) rings.