This is a general outline of Lebron to Cavs trade. Specific contract numbers have to be negotiated because Cavs have to operate as a hard capped team after the trade.
Cavs get out of significant salary by trading Jarrett Allen to the Lakers and Strus and Schroder to the Nets to avoid the 2nd apron. They will have to negotiate Harden's new contract as well. They get either Sharpe or Ayton to be the back up C behind Mobley.
Lakers swap Lebron for Allen. They may trade Knecht or Jake as part of this trade. If Ayton opts in, he might be included as well.
Nets utilize their salary cap to absorb Strus and Schroder, who are still productive role players. They move up from the 33rd and 43rd 2nd round picks to 25th (Lakers) and 29th (Cavs) picks. They will then try to consolidate draft picks to move up in the draft since they will hold 6, 25, 29.