Complex sentence: It performs similarly to BMW's Valvetronic system but operates to a higher engine speed (RPM), other systems have been announced by Honda (Advanced VTEC or AVTEC) and Toyota (Valvematic).
Split into simpler sentences: It performs similarly to BMW's Valvetronic system but operates to a higher engine speed (RPM). Similar functioning systems have been announced by Honda (Advanced VTEC or AVTEC) and Toyota (Valvematic).