String text = "Some\n\ntext\nwith\nnewlines";
char[] chars;
float textWidth;

void setup() {
    size(500, 500, P2D);
    textFont(createFont("Arial", 50));
    textAlign(LEFT, TOP);
    chars = text.toCharArray();
    textWidth = textWidth(text.substring(6, text.length()));
}

void draw() {
    background(20);
    
    fill(#FF5555);
    text(chars, 6, text.length(), 0, 0);
    
    fill(#55FF55);
    text(text.substring(6, text.length()), width / 2, 0);
}