Complex sentence: In the summer of 2012, three engines suffered Low Pressure Turbine (LPT) failures; one was caused by an assembly problem, which led to inspections of all other engines then in service.
Split into simpler sentences: In the summer of 2012, three engines suffered Low Pressure Turbine (LPT) failures. One failure was caused by an assembly problem, which led to inspections of all other engines then in service.