Complex sentence: The major instant messaging networks have in the past been rather hostile towards multiprotocol clients breaking them through small protocol changes, at one stage trillian was making a release every few days as aol changed their servers to break them.
Split into simpler sentences: The major instant messaging networks have in the past been rather hostile towards multiprotocol clients breaking them through small protocol changes. At one stage "Trillian" developers team was making a release every few days since AOL changed their servers frequently to break them.