What's the easiest way to split a list into a specific number of rows and columns?

fakewen 

Another option with Power Query with your values formatted as Table (named Table1 below)

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    FromRows = (list as list, columns as number) as table =>
        Table.Combine(
            List.Transform(
                List.Split(list, columns),
                each Table.FromRows({_})
            )
        ),

    Result = Table.Combine(
        {
            FromRows(Table.FirstN(Source, 12)[Values], 4),
            FromRows(Table.Skip(Source, 12)[Values], 3)
        }
    )
in
    Result

Benefit: the blank cells are really empty (null)