Complex sentence: Some lines are magnetically sensitive, such as 994.813 and 995.825 nm are broadened by the Zeeman effectand others in the same band are insensitive like 994.911 and 995.677 nm.
Split into simpler sentences: Some lines are magnetically sensitive, such as 994.813 and 995.825 nm. They are broadened by the Zeeman effect yet others in the same band are insensitive to magnetic fields like 994.911 and 995.677 nm.