Complex sentence: Two of the more active developers, Andrew Eddie and Adam Donnison applied for, and were subsequently granted, administration rights to the project and continued to develop until Andrew moved on to Mambo and subsequently Joomla.
Split into simpler sentences: Two of the more active developers, Andrew Eddie and Adam Donnison applied for, and were subsequently granted, administration rights to the project. Andrew continued to work on the project until he moved on to Mambo and subsequently Joomla.