Complex sentence: The polycarbonate visor can open on hinges mounted near the ears and seals with an anodised aluminium clavicle flange when closed; the hood or'soft helmet' folds when the visor is raised.
Split into simpler sentences: The polycarbonate visor can open on hinges mounted near the ears and seals with an anodised aluminium clavicle flange when closed. The hood or'soft helmet' folds when the visor is raised.