Complex sentence: The stand is made up of two tiers, only the upper tier is covered but at the expense of several supporting columns for the roof structure, the seats are the originals from the early 1900s, from here you get a decent view with moderate legroom.
Split into simpler sentences: The stand is made up of two tiers, with only the upper tier covered, but at the expense of several supporting columns for the roof structure. The seats are the originals from the early 1900s, and from here you get a decent view with moderate legroom.