After many attempts, I was finally able to do this. In fact, I did the download and used the vmware converter to combine the two disks into one. After that, I was able to connect the newly created drive to the VitrualBox.
The steps taken are very simple:
BEFORE YOU NOTHING!
1) MAKE BACKUP !!! Even if you follow this instruction, you can damage things, so make a backup. Just close the virtual machine, and then create a copy of the directory in which the VM is located.
2) Remove VMware Tools from the virtual machine that you are going to convert. If for some reason you forget this step, you can still delete it after everything works under VirtualBox by following these steps . Do yourself a favor and just do it now.
NOW START A PART !!!
1) Download and install VMware Converter . I used 5.0.1 build-875114, just use the latest version.
2) Download and install VirtualBox
3) Run the VMWare converter:

4) Click Convert machine
6) Go to .vmx for your virtual machine and click Next .

7) Give the new virtual machine a name and select the place where you want to put it. Click Next

8) Click Next on the Options screen. You do not need to change anything here.

9) Click Finish on the Summary screen to start the conversion.

10) The conversion should begin. It takes LOOONG time, so be patient.

11) I hope everything went well, if this happened, you should make sure that the conversion is complete:

12) Now open VirtualBox and click New .

13) Give your virtual machine a name and select what Type and Version . Click Next .

14) Select the size of the memory you want to transfer. Click Next .

15) For Hard Drive click Use and existing hard drive file and select the newly converted .vmdk file.

16) Now click Settings and select the Storage menu. The problem is that by default, VirtualBox will add the drive as an IDE. This will not work, and we need it because we need to put it on the SCSI controller.
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17) Select the IDE controller and the Remove Controller button.

18) Now click the Add Controller button and select Add SCSI Controller

19) Click the Add Hard Disk button.

20) Click Choose existing disk

21) Select the .vmdk file. Click OK

22) Select the System menu.

23) Click Enable IO APIC . Then click OK

24) Congratulations !!! Your virtual machine is now corrupted! Click Start to start the VM!
