Complex sentence: His role in GamerGate led to a petition to prevent Baldwin from speaking at the Supanova Pop Culture Expo, the management with much deliberation and in response to a counter petition decided that his political stance should not affect his guest appearance.
Split into simpler sentences: His role in GamerGate led to a petition to prevent Baldwin from speaking at the Supanova Pop Culture Expo. The convention's management eventually decided after much deliberation and in response to a counter petition that Baldwin's political stance should not affect his guest appearance.