Perhaps this?

   $_ = "<*2>FOO<2,1>,<*3>(SigB<8:0:2>,BAR),<*2>Siga<2:0>,Sigb<8,7,6,5
+,0>"; 
   @line = split(/,(?![\w,]+[>)])/, $_); 
   print join("\n", @line), $/;
[download]

Which prints:

   <*2>FOO<2,1>
   <*3>(SigB<8:0:2>,BAR)
   <*2>Siga<2:0>
   Sigb<8,7,6,5,0>
[download]

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