[译] 那篇作文有许多拼写错误;虽然如此,尚不失为一篇好作文。
[误] It has many spelling mistakes; even so it is quite a good composition.

[正] It has many spelling mistakes; even so, it is quite a good composition.
[注] even so的意思是though that is the case(虽然如此),属副词性质的词组,所以不能用来连接句子,而且要用逗号隔开。