Gnome Split.
GNOME Split is an application built using Java and GTK+ toolkit that enables you to split and join files. To install Gnome Split you can download it from their website or just execute the following instructions in your terminal.
[stextbox id="grey"]sudo add-apt-repository ppa:gnome-split-team/ppa
sudo apt-get update
sudo apt-get install gnome-split[/stextbox]
The interface is neat and easy to use. Here is the snapshot.
More snapshots can be found at their official website.