They are working and 'have a lot of business things' (nie jest jasno o co chodzi tutaj) to do. 'It' (nie rozumiem do czego to 'it' sie odnosi, trzeba jasniej napisac) 'makes' (nie za dobre slowo) that they do not like spending their spare time on cooking (ale czego, napisz 'meals'). 'It' (ja bym polaczyla te zdania i dala, which ultimately) leads to (tu brakuje 'them') eating out. I think that it is good thing and there are a lot of advantages 'and also' (nie rozumiem co te slowa tutaj robia) of dining out.
The main advantage of this situation is that it is 'a' (jak dajesz przedimek, to musisz dac rzeczownik na koncu zdania, bez przedimka moze byc jak jest) very comfortable.
Thanks to that they can spend their spare time with friends or family and even if they want 'on working' (nie za jasno o co wlasciwie chodzi). 'And' (nie zaczynaj zdan z 'and') of course, after eating they do not have to clean up after 'yourself' (alew jak dajesz 'they' to znaczy l. mnoga, tutaj tez musi byc l. mnoga).
There are no 'contraindications' (cos mi tu nie tak, poszukaj inne slowo) to get what they need.
When they 'are going' (wystarczy 'go') out they do not care about it.
The last 'one' (dlaczego tlumaczysz slowo w slowo z jez. polskiego, nie tedy droga) plus for dining out is that it is not as expensive as everyone thinks. There are places where food is a very tasty and what is more (it is) cheap. Especially (ale co? musisz wytlumaczyc) , it is a great option for students who do not have a lot of money. In every town THERE are milk bars or different cheap restaurants where they can eat 'a' (niepotr) homemade food.
'People' (nie, bo tutaj wtedy nie wiadomo o kim mowa, lepiej daj 'Diners') do not prepare meals so they do not know what ingredients have been used. The 'cookers' (nie, to jest zle slowo, moze cook, chef, ale 'cooker' to jest to na czym gotujesz) can use 'an' (nie stawiamy przedimkow przed l. mn) outdated ingredients.
I like to experiment in the kitchen, but if I am not 'be' (niepotr slowo) in the mood to cook I will go out and eat something delicious.
...Reszta zdan o.k.