Complex sentence: While he was in WWE, Tazz talked to him about Brock Lesnar, a developmental wrestler who was receiving "the worst advice possible", so Heyman helped him with the "different advice than what he was receiving".
Split into simpler sentences: While he was in WWE, Tazz spoke to him about Brock Lesnar, a developmental wrestler who was receiving "the worst advice possible". Heyman mentored Lesnar and gave him "different advice than what he was receiving".