Function to Altering Text String

Hi experts !

I need a function to alter the content of an item description text. I want to insert a piece of text after the first "." found on the string. I want to do it 3 times, with the first 3 "." found.

Please see the code attached and see the image attached which is an example on how result should be.

Rewrite_Description($add1,$add2,$add3, $description)

Please help me with a good function to make possible this.

<?php 

$add1 = "The Author of this Book is Matt Green.";
$add2 = "This book was written on 1999.";
$add3 = "The Genero of this book is Fiction";

$description = "The drama was cultivated by the Incas, and dramatic performances were enacted before them. Garcilasso de la Vega, Molina, and Salcamayhua are the authorities who received and have recorded the information given by the Amautas respecting the Inca drama. Some of these dramas, and portions of others, were preserved in the memories of members of Inca and Amauta families. The Spanish priests, especially the Jesuits of Juli, soon discovered the dramatic aptitude of the people.";

?>

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