Complex sentence: The story follows Marina, a girl who was discovered alone in the grey and unknown to all of arclights citizens, when she is beought to arclight she has no recolection of who she is or where she comes from.
Split into simpler sentences: The story follows Marina, a girl who was discovered alone in the grey and unknown to all of Arclight's citizens. When she is brought to Arclight, she has no recollection of who she is or where she comes from.