Complex sentence: Google publishes most of the code (including network and telephony stacks) under the non-copyleft Apache License version 2.0, and the rest, Linux kernel changes, under the GNU General Public License version 2.
Split into simpler sentences: Google publishes most of the code (including network and telephony stacks) under the non-copyleft Apache License version 2.0. The rest, Linux kernel changes, are released under the copyleft GNU General Public License version 2.