The phrase "caused by them" is correct and can be used in written English.
It is used to indicate that something has been caused or brought about by a group or person. For example, "The recent water shortages have been caused by them not managing resources effectively".
"Most of the side-effects attributed to the drugs but not necessarily caused by them are very common.
A BBC poll broadcast Wednesday said 80percentt of Britons supported the blockades despite the inconveniences caused by them.
It is not difficult to find reports of crashes, near misses and serious injuries being caused by them.
Fire officials said at least 14 people were taken to hospital with minor injuries, mostly caused by them sliding down the inflatable chutes.
Is the media willing to unearth the improvements made as a result of safety issues, as well as the problems caused by them?
What do you think of the so-called "findings" that a lot of kids' social and behavioural problems are caused by them having mothers who work?
In other words, feelings do not cause bodily symptoms but are caused by them: we do not tremble because we feel afraid; we feel afraid because we tremble.
Although the economy continues to add jobs, global trade, immigration, layoffs and technology — as well as the insecurity caused by them — appear to have eroded workers' bargaining power.
"In your second year of office, unfortunately, your opponents try to make you own some problems caused by them years ago," Mr. Paterson said.
Corresponding to these are the Finnish maahiset and Lude muahiset, which refer both to the spirits and to an illness caused by them.
The hope was to reduce deaths caused by them, by 2015, by between a half and three-quarters of their 1990 levels.
