Complex sentence: Since 2010, effort has been underway to build the Linux kernel with Clang, an alternative compiler for the C language; as of 12 April 2014, the official kernel could almost be compiled by Clang.
Split into simpler sentences: Since 2010, effort has been underway to build the Linux kernel with Clang, an alternative compiler for the C language. As of 12 April 2014, the official kernel could almost be compiled by Clang.