WOULD YOU PLEASE STOP SHOUTING? WE ARE NOT YET DEAF!

split expects a regular expression as its first parameter. + has a special meaning (quantifier) in regular expressions, you have to escape it.

A nasty trap of split is that you can pass the RegExp as string. Better use // or qr() for that, so your intention becomes more clear. And to escape the +, either prefix it with a backslash or make it a one-character character class:

my @array=split /\+/,$someString;
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or

my @array=split /[+]/,$someString;
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Alexander