Complex sentence: Released under the terms of the GNU General Public License, Synergy is free software, but downloads of compiled binaries are no longer offered for free and require a one-time payment of $19 for the Basic edition or $29 for the Pro edition.
Split into simpler sentences: Released under the terms of the GNU General Public License, Synergy is free software. Downloads are no longer offered for free and require a one-time payment of $19 for the Basic edition or $29 for the Pro edition.