Complex sentence: The Bitcoin-Qt GUI was initially designed by Wladimir J. van der Laan, it is now maintained by the contributing developers of Bitcoind, which it has been bundled in since version 0.5.
Split into simpler sentences: The Bitcoin-Qt GUI was initially designed by Wladimir J. van der Laan. It is now maintained by the contributing developers of Bitcoind, which it has been bundled in since version 0.5.