Assuming you want to discard the {}s:
$str = 'Iteration {Applied Field} {Total Energy} Mx Fx {a} B C D {
+E F} G';;
print for split '(?:}\s+{|\s+{|}\s+|\s+(?!\S+}))', $str;;
Iteration
Applied Field
Total Energy
Mx
Fx
a
B
C
D
E F
G
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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