Simply add the following CSS code to custom CSS box in theme options.

.et_pb_fullwidth_slider_0 .et_pb_slide_1 .et_pb_slide_description{
text-align:left!important;
}
.et_pb_slide_description {
float: left;
padding-left: 0;
width: 65%;
padding-bottom: 0px;
}
.et_pb_slider .et_pb_container {
max-width: 100%;
width: 100%;
float: left;
}