If you don't mind keeping "WINGFRAME " in your elements use zero-width look-behind and -ahead assertions to split at points in the string that are not preceded by beginning of string and are followed by "WINGFRAME ".

$ perl -Mstrict -MData::Dumper -wle '
> my $line = q{WINGFRAME  MACH1;VECTORTHRUST 40 00 40 40;VECTORTHRUST 
+60 00 40 90;VECTORTHRUST 10 40 30 10;VECTORTHRUST 80 10 10 10;VECTORT
+HRUST 60 10 95 00;VECTORTHRUST 70 00 60 00;VECTORTHRUST 80 00 70 90;V
+ECTORTHRUST 60 50 80 90;VECTORTHRUST 60 40 80 10;WINGFRAME  MACH2;VEC
+TORTHRUST 40 00 40 40;VECTORTHRUST 60 00 40 90;VECTORTHRUST 10 40 30 
+10;VECTORTHRUST 80 10 10 10;VECTORTHRUST 60 10 95 00;VECTORTHRUST 70 
+00 60 00;VECTORTHRUST 80 00 70 90;VECTORTHRUST 60 50 80 90;VECTORTHRU
+ST 60 40 80 10;};
> my @arr = split m{(?x) (?<!\A) (?=WINGFRAME )}, $line;
> print Data::Dumper->Dumpxs( [ \ @arr ], [ qw{ *arr } ] );'
@arr = (
         'WINGFRAME  MACH1;VECTORTHRUST 40 00 40 40;VECTORTHRUST 60 00
+ 40 90;VECTORTHRUST 10 40 30 10;VECTORTHRUST 80 10 10 10;VECTORTHRUST
+ 60 10 95 00;VECTORTHRUST 70 00 60 00;VECTORTHRUST 80 00 70 90;VECTOR
+THRUST 60 50 80 90;VECTORTHRUST 60 40 80 10;',
         'WINGFRAME  MACH2;VECTORTHRUST 40 00 40 40;VECTORTHRUST 60 00
+ 40 90;VECTORTHRUST 10 40 30 10;VECTORTHRUST 80 10 10 10;VECTORTHRUST
+ 60 10 95 00;VECTORTHRUST 70 00 60 00;VECTORTHRUST 80 00 70 90;VECTOR
+THRUST 60 50 80 90;VECTORTHRUST 60 40 80 10;'
       );
$
[download]

If you really don't want the "WINGFRAME " text then remove it by substitution in a map.

$ perl -Mstrict -MData::Dumper -wle '
> my $line = q{WINGFRAME  MACH1;VECTORTHRUST 40 00 40 40;VECTORTHRUST 
+60 00 40 90;VECTORTHRUST 10 40 30 10;VECTORTHRUST 80 10 10 10;VECTORT
+HRUST 60 10 95 00;VECTORTHRUST 70 00 60 00;VECTORTHRUST 80 00 70 90;V
+ECTORTHRUST 60 50 80 90;VECTORTHRUST 60 40 80 10;WINGFRAME  MACH2;VEC
+TORTHRUST 40 00 40 40;VECTORTHRUST 60 00 40 90;VECTORTHRUST 10 40 30 
+10;VECTORTHRUST 80 10 10 10;VECTORTHRUST 60 10 95 00;VECTORTHRUST 70 
+00 60 00;VECTORTHRUST 80 00 70 90;VECTORTHRUST 60 50 80 90;VECTORTHRU
+ST 60 40 80 10;};
> my @arr =
>    map { s{WINGFRAME }{}; $_ }
>    split m{(?x) (?<!\A) (?=WINGFRAME )}, $line;
> print Data::Dumper->Dumpxs( [ \ @arr ], [ qw{ *arr } ] );'
@arr = (
         ' MACH1;VECTORTHRUST 40 00 40 40;VECTORTHRUST 60 00 40 90;VEC
+TORTHRUST 10 40 30 10;VECTORTHRUST 80 10 10 10;VECTORTHRUST 60 10 95 
+00;VECTORTHRUST 70 00 60 00;VECTORTHRUST 80 00 70 90;VECTORTHRUST 60 
+50 80 90;VECTORTHRUST 60 40 80 10;',
         ' MACH2;VECTORTHRUST 40 00 40 40;VECTORTHRUST 60 00 40 90;VEC
+TORTHRUST 10 40 30 10;VECTORTHRUST 80 10 10 10;VECTORTHRUST 60 10 95 
+00;VECTORTHRUST 70 00 60 00;VECTORTHRUST 80 00 70 90;VECTORTHRUST 60 
+50 80 90;VECTORTHRUST 60 40 80 10;'
       );
$
[download]

I hope this is helpful.

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