Imagine two people, let's call them Mr. and Mrs. MacLennan, who were married to each other. But, unfortunately, they decided to separate and eventually get a divorce. When a married couple decides to get a divorce, they need to divide their stuff and money in a way that is fair to both of them. This is called a "division of assets."
In the case of Mr. and Mrs. MacLennan, they didn't agree on how to divide their assets fairly. Mrs. MacLennan believed that she should get a bigger share because she had worked hard to support her husband's career while they were married, and he had been unfaithful to her.
However, Mr. MacLennan argued that the assets should be divided equally, with each person getting half. The problem is that there were some assets that were difficult to split evenly, like the home they shared or their investments.
So the case went to court, where a judge had to decide how to divide the assets fairly. In the end, the judge agreed with Mrs. MacLennan that she should get a bigger share of the assets, given her contributions to the marriage and Mr. MacLennan's infidelity.
This case set an important legal precedent in Canada that recognized the important role that both partners play in a marriage, and that a fair division of assets should take into account all the different contributions each person made during the marriage.