Complex sentence: The time from time 1 to time 2 he describes as the Acquisition Period and between time line 2 and 3 as the Incubation Period (1982: 520).
Split into simpler sentences: The time from time 1 to time 2 is described as the Acquisition Period. Between time 2 and 3 is known as the Incubation Period (1982: 520).