Complex sentence: The Labour Government of 1997-2010 held five referendums on devolution, four of which received a yes majority although despite the number of referendums that was held during this period no UK-wide referendum was held.
Split into simpler sentences: The Labour Government of 1997-2010 held five referendums on devolution, four of which received a yes majority. Despite the number of referendums that was held during this period no UK-wide referendum was held.