Complex sentence: After the teams's struggles over the last season and a half, Mazzilli was relieved of his duties and was replaced by his bench coach, Sam Perlozzo, the person of whom Angelos originally wanted for the job.
Split into simpler sentences: After the teams's struggles over the last season and a half, Mazzilli was relieved of his duties. He was replaced by his coach, Sam Perlozzo, the person of whom Angelos originally wanted for the job.