During his reign, two working <e1>groups</e1> under the lead of the engineer Eupalinos dug a <e2>tunnel</e2> through Mount Kastro.
During his reign, two
During his reign, two working groups under the lead of the engineer Eupalinos dug a tunnel through Mount Kastro.
<triplet> groups <subject> tunnel <object> Product-Producer(e2,e1)