What does the author mean by the line in bold?

the way the characters are represented in waiting for godot is similar to a style of theatre also seen in the play rosencrantz and guildenstern are dead.
the way the characters are represented in rosencrantz and guildenstern are dead is similar to a style of theatre also seen in the play waiting for godot.
the unpopular changes made to hamlet in rosencrantz and guildenstern are dead were corrected later in the play waiting for godot.
the unpopular changes made to hamlet in waiting for godot were corrected later in the play rosencrantz and guildenstern are dead.