The longer two people are married the less important it is where the assets came from or who generated the asset.
There is always a debate surrounding what part of the pension should be included as a marital asset, the fact is when the marriage is long the judge tends to include the whole pension, right up to judgement, even when those two people are separated, even for a few years.
Mine was a long marriage / relationship 24 and half years, 20 years marriage, child before marriage. Pension report done to show how it should be split. still refuses to even discuss settlement 20 months on!!!