Complex sentence: A detachment of the People's Armed Police also participated in the parade, the unit chosen had previously been a PLA one and can trace its lineage, through the 114th Division of the 38th Army, to regiments that fought during the war.
Split into simpler sentences: A detachment of the People's Armed Police also participated in the parade, the unit having previously been part of the PLA. The unit's lineage, through the 114th Division of the 38th Army, can also be traced to regiments that fought during the war.