Their leisure activities are divided six pies.
.... pie is the circular figure and in this case you have two pie charts and each pie is divided into six sectors.
Their leisure activities are illustrated by the six sectors in each pie chart.
As we know that we are living in technological age and the pie graph which shows boy's leisure activities indicates that boys are really interested in computer games about %34.
... You are supposed to discuss about the graphical presentation. So the part I have highlighted sounds irrelevant.
In contrast to boys,girls aren't interested in computer games.
In contrast to boys, girls show less interest in computer games.