Complex sentence: Many of the structures in the site were built in the early Angel 2 phase (1200 to 1325), which according to the stratigraphy of midden deposits, was the earliest Middle Mississippian occupation of Angel.
Split into simpler sentences: Many of the structures in the site were built in the early Angel 2 phase (1200 to 1325). According to the stratigraphy of midden deposits, this was the earliest Middle Mississippian occupation of Angel.