英语翻译他在物理和化学方面有很丰富的教学经验,曾经长期在清华大学,北京大学授课

He has senior teaching experience on Physics and Chemistry as he had given lessons in Tsinghua University for a long time as well as Peking University

楼上的extensive用得很精彩！但是experience用作经历时应该是可数名词，另外后面跟in表示方面。后一句一般，结构也有问题，大家研究一下：
He has extensive experiences in teaching physics and chemistry, and he has given lessons in Tsingwa University as while as Peking University for a long time.
另注：清华北大因为历史原因，英文名字还是使用广东发音的音译，一直流传，没变现代发音。

He has extensive experience teaching physics and chemistry; he has taught for a long time at Qinghua University and Beijing University.

楼上那位 校名写错了
还是用复合句会比较漂亮
“has been doing...with状语从句”
He has been teaching at Peking University and Tsinghua University for a very long time with his wealthy teaching experiences on physics as well as chemistry.