The vampire broke the coffin and came out all by himself.
The vampire swung open the casket all by himself and then jumped out.
ーThe vampire broke the coffin and came out all by himself.
「吸血鬼は棺を壊し自力で中から出てきた」
vampire で「吸血鬼」
coffin で「棺」
to come out で「出てくる」
all by oneself で「自力で」
ーThe vampire swung open the casket all by himself and then jumped out.
「吸血鬼は自力で棺を大きく開き、飛び出してきた」
to swing open で「（扉などを）大きく開く」
to jump out で「飛び出る・飛び出す」
ご参考まで！
カナダ 
