When you want to mention not just one, but two or more reasons, you can use し in place of から. し usually follows a predicate in the short form.
reason し、reason し、situation.
Yesterday was a great day--a letter came from my family, and I talked with my boyfriend on the phone
Notye that し follows the short forms. In present tense sentences, this means that だ appears with な-adjectives and nouns, but not with い-adjectives.