Complex sentence: Since IRC networks require low bandwidth and use simple methods for communication they have been also used to host botnets and are tend to simple in construction and have been used many times for coordinating DDoS attacks or spam campaigns while switching channels to avoid being taken down.
Split into simpler sentences: Since IRC networks require low bandwidth and use simple methods for communication they have also been used to host botnets and tend to be simple in construction. They have been used many times for coordinating DDoS attacks or spam campaigns while switching channels to avoid being taken down.