Both から and ので work well, but ので is more appropriate since you are using polite forms. Also, 上手では sounds more polite/formal.
英語で言います can convey what you want to say correctly, but I would use 英語で説明しようと思います.
Both から and ので work well, but ので is more appropriate since you are using polite forms. Also, 上手では sounds more polite/formal.
英語で言います can convey what you want to say correctly, but I would use 英語で説明しようと思います.