Are these sentences natural? Our company, Tianjin Tengda Changsheng Commerce and Trade Co., Ltd., has known Tianjin Haochun Yida Commerce and Trade Co., Ltd. and its legal person Zhao xx for 8 years. Our company established business relations with Mr. Zhao Yongsheng in May 2010. And we have maintained a long-term business relationship until now. Hi. Are these sentences natural? I translate them from a Chinese text. Can you improve them? Thank you.