Complex sentence: The conservative cabinet of that time did not look into the issue, while the second cabinet Stoltenberg announced a common, unified marriage act as part of its foundation document, the Soria Moria statement.
Split into simpler sentences: The conservative cabinet of that time did not look into the issue. However, the second cabinet Stoltenberg announced a common, unified marriage act as part of its foundation document, the Soria Moria statement.