Complex sentence: This type of clientelism constructed a platform through which political corruption had the opportunity to flourish: little political competition and organization outside of the party existed; it was not possible to independently contest the PRI system.
Split into simpler sentences: This type of clientelism constructed a platform through which political corruption had the opportunity to flourish. Beyond this, there was little political competition and organization outside of the party; it was not possible to independently contest the PRI system.