You can create multiples animations in a slide.
use PhpOffice\PhpPresentation\Slide\Animation;
$oAnimation1 = new Animation();
$oAnimation1->addShape($oDrawing);
$oSlide->addAnimation($oAnimation1);
$oAnimation2 = new Animation();
$oAnimation2->addShape($oRichText);
$oSlide->addAnimation($oAnimation2);