String s1 = 'Ranger Rover, other text';
String s2 = 'Range Rover Sport, other text';

String s1 = 'Range Rover other text';
String s2 = 'Range Rover Sport other text';
List<String> lista = new List<String>();
lista.add(s1);
lista.add(s2);
for (String s : lista)
{
   if (s.indexOf('Range Rover Sport') == -1)
   {
      System.debug('WITHOUT SPORT '+s);
   }
   else {
      System.debug('WITH SPORT '+s);
   }
}

list<string> s1list=s1.split(',');
list<string> s2list=s2.split(',');
if(s1list[1]==s2list[1]){
do stuff
}