Complex sentence: Second, the mortuary temple was constructed into an L-shape rather than the typical T-shape of the time; an alteration which was a result of the presence of mastabas east of the site of the temple.
Split into simpler sentences: Second, the mortuary temple was constructed into an L-shape rather than the typical T-shape of the time. An alteration which was a result of the presence of mastabas east of the site of the temple.