Change the root commit parent to point to another commit (connecting two independent git repositories)

I have a project that has more than 3 years of history in the svn repository. It was migrated to git, but the guy who did this, just take the last version and throw out all these 3 years of history.

Now the project has the last 3-4 months of history in one repository, and I've imported the other 3 years of svn history into a new git repository.

Is there some way to connect the root commit of the second repository into the last commit of the first one?

It is something like this:

  *   2017-04-21 - last commit on master
  |   
  *   2017-03-20 - merge branch Y into master
  |\  
  | * 2017-03-19 - commit on branch Y
  | | 
  * | 2017-03-18 - merge branch X into master
 /| * 2017-02-17 - commit on another new branch Y
* |/  2017-02-16 - commit on branch X
| *   2017-02-15 - commit on master branch
* |   2017-01-14 - commit on new branch X
 \|   
  *   2017-01-13 - first commit on new repository
  |   
  *   2017-01-12 - init new git project with the last version of the code in svn repository
  .   
  .   
There is no relationship between the two different repositories yet, this is what I wanna
do. I want to connect the root commit of 2nd repository with the last commit of the first
one.
  .
  .   
  *   2017-01-09 - commit
  |   
  *   2017-01-08 - commit
  |   
  *   2017-01-07 - merge
 /|   
* |   2016-01-06 - 2nd commit the other branch
| *   2016-01-05 - commit on trunk
* |   2016-01-04 - commit on new branch
 \|   
  *   2015-01-03 - first commit
  |   
  *   2015-01-02 - beggining of the project

Update:

I just learn that I need to do a git rebase, but how? Please, let's consider the commit dates like it was the SHA-1 codes... The answer was to use git filter-branch with --parent-filter option, not a git rebase.

Update 2:

I tried the command git filter-branch --parent-filter 'test $GIT_COMMIT = 443aec8880e898710796a1c4fb4decea1ca5ff66 && echo "-p 98e2b95e07b84ad1e40c3231e66840ea910e9d66" || cat' HEAD and it didn't work:

PS D:\git\rebase-test\rep2cc> git filter-branch --parent-filter 'test $GIT_COMMIT = 443aec8880e898710796a1c4fb4decea1ca5ff66 && echo "-p 98e2b95e07b84ad1e40c3231e66840ea910e9d66" || cat' HEAD
fatal: ambiguous argument '98e2b95e07b84ad1e40c3231e66840ea910e9d66 || cat': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

Update 3:

It didn't work on Windows CMD or PowerShell, but it did work in Git Bash on windows.