Complex sentence: At the time, Terry Bickers was of this opinion already-having always been unhappy with the implications of the Fontana deal, and now feeling justified in his fears, he began to retreat into anxiety and drugs, eventually succumbing to manic depression.
Split into simpler sentences: At the time, Terry Bickers was of this opinion already. Having always been unhappy with the implications of the Fontana deal, and now feeling justified in his fears, he began to retreat into anxiety and drugs, eventually succumbing to manic depression.