Views Complex Grouping

The Views Complex Grouping allow you to
- Attached fields to each grouping field
- Limit the number of rows under each grouping field

View Default Grouping 
-Group by Field 1 Value 1
    - Field 2 Value 1
    - Field 2 Value 4
    - Field 2 Value 5
    - Field 2 Value 6
-Group by Field 1 Value 2
    - Field 2 Value 2
    - Field 2 Value 3

View Complex Grouping 
-Group by Field 1 Value 1
+ Attach Field 3 Value 1
+ Attach Field 4 Value 1
    - Field 2 Value 1
    - Field 2 Value 4
-Group by Field 1 Value 2
+ Attach Field 3 Value 2
+ Attach Field 4 Value 2
    - Field 2 Value 2
    - Field 2 Value 3

There is currently no way using Views to attach fields on the same level as the group by fields. This module enable you to do it. You can also limit the number of rows rendered for each grouping.

Live examples:
Example 1
Example 2
Example 3