If you allow Perl to tell you about things it considers weird, you'll get more information:
use warnings;
my $text="ABCDE<\/Text>TUVWX";
my @splitted=[];
@splitted=split("\<\/Text\>".$text);
print "0.".$splitted[0]."\n";
print "1.".$splitted[1]."\n";
__END__
Use of uninitialized value $_ in split at tmp.pl line 7.
This is because you only pass one argument to split, instead of two arguments.
One argument is because of the dot instead where you would want to write a comma:
@splitted=split("\<\/Text\>".$text);
# ^
Also, the first argument to split is a regular expression, not a string. You might want to change your code to accomodate that:
@splitted=split(m!\<\/Text\>!, $text);
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