The problem is that your json
saved in the text document has an incorrect syntax ie it is not a json
valid.
I do not know how you save in text but after each object and before closing them you put a comma, it is wrong so it invalidates your document as json
if you can correct it, a functional example for whatever it would be something like this:
file.txt
[ { "Nome": "Hemerson", "data": "05/11"
}, { "Nome": "Hemerson", "data": "06/11"
} ]
test.php
<?php
// leia o arquivo
$file = file_get_contents('file.txt');
// decodifique em array associativo para poder pegar a ultima posição
$decode = json_decode($file, true);
// pegue a ultima posição
$ultimo = end($decode);
// acesse o valor pela chave correspondente exemplo "data"
echo $ultimo['data'];
// isso ira imprimir: 06/11