Complex sentence: Ancient Greek weapons and armor were primarily geared towards combat between nation was the phalanx, a massed shield wall, which required heavy frontal armor and medium-ranged weapons such as spears.
Split into simpler sentences: Ancient Greek weapons and armor were primarily geared towards combat between nation. Their primary technique was called the phalanx, a formation consisting of massed shield wall, which required heavy frontal armor and medium-ranged weapons such as spears.