Complex sentence: When the "Enterprise" was reassigned to the Delphic Expanse, Starfleet technicians installed this new weaponry, which were named photonic torpedoes, the differences between photon torpedoes and photonic torpedoes are unknown.
Split into simpler sentences: When the "Enterprise" was reassigned to the Delphic Expanse, Starfleet technicians installed this new weaponry, which was named photonic torpedoes. The differences between photon torpedoes and photonic torpedoes are unknown.