The three diagrams show how the hospital grew from 1960 to 2000, to cater for the increase in demand for medical facilities, especially the cancer centre. The change in requirements and priorities over the years resulted in changes and expansions of the buildings and change of land use.
In 1960, the hospital building occupied only a quarter of the land with the remaining areas equally divided between a shopping centre next to it and a carpark and farmland at the back.
By 1980, the shopping centre was converted into a cancer centre and a pharmacy while a nursing school was built over the farmland. By 2000, the cancer centre expanded three-fold, fully occupying the nursing school building which was relocated to occupy part of the carpark.
I think there is no need to describe the location of the spaces(which your subordinate clauses were about) which are clear from the diagram. It is more important to describe the changes that took place and make comparisons.
I do not like the description, "that minimized the acreage of the nursing school instead"
Student or Learner