a ambos lados de

= on either side of
Ex: An alternative form of hose, probably invented in Holland in the earlier seventeenth century, took the form of an iron yoke on either side of the spindle in place of the wooden box = Una forma alternativa de matriz, inventada probablemente en Holanda a comienzos del siglo XVII, consistía en un yugo de hierro a ambos lados del husillo en lugar del cajón de madera.

= on both sides of + Lugar
Ex: This goal was achieved to a greater or a lesser extent on both sides of the Alps.