Complex sentence: It uses a main spring like mechanical watch to store the watch energy, it does not have a convential escapement to regulate the unwinding of a spring, but a device that Seiko calls a'Tri Synchro regulator'.
Split into simpler sentences: It uses a main spring like a mechanical watch to store the watch energy. It does not have a conventional escapement to regulate the unwinding of a spring, but a device that Seiko calls a'Tri Synchro regulator'.