し is used to emphatically add information to a statement, implying that something is among other things(that may be not mentioned as well). The simple formula is as follows:
- Verbs: Informal termination + し
- i-Adjs: i-Adj+し: 美味しい → 美味しいし.
- na-Adjs/nouns: na-Adj/noun + だし: 静か → 静かだし
e.g. その喫茶は料理が美味しし、値段がひくいし、それに駐車場があるし。 The food on that restaurant is delicious(among the next facts), also the prices are low, and what's more, they also have parking.
We can see the emphatically adding of information here which are roughly transaltion for し. You can even end a sentence with this (although is sometimes not seen as correct).