It's not that big of a deal. It's an LGPL-licensed codebase which incorporated BSD-licensed modules (there's nothing wrong with that). Since LGPL places some requirements on being intermingled with incompatibly-licensed software, the author made sure to point out which parts were under the more permissive BSD license so people could re-use those parts and not be subject to LGPL by using his project as a whole.
In a nutshell, if you use an LGPL codebase, make sure either: (1) your code is LGPL or under a compatible license or (2) that you only use the code on an API level and dynamically link to it.
Btw, LGPL is a license accepted by many enormous communities, such as Qt.
If you want to fork this project, easiest route is to just re-apply the LGPL license and fork after the point where notice of BSD parts was added, because it's a violation of BSD to not mention their license.
IANAL