英语阅读中有句话不懂,

英语阅读中有句话不懂,
General concern about misleading tactics that advertisers employ is centered on the use of exaggeration.Consumer protection groups and parents believe that children are largely ill-equipped to recognize such techniques and that often exaggeration is used at the expense of product information.Claims such as "the best' or “better than" can be subjective and misleading; even adults may be unsure as to their meaning.They represent the advertiser's opinions about the qualities of their products or brand and,as a consequence,are difficult to verify.Advertisers sometimes offset or counterbalance an exaggerated claim with a disclaimer—a qualification or condition on the claim.For example,the claim that breakfast cereal has a health benefit may be accompanied by the disclaimer "when part of a nutritionally balanced breakfast.' However,research has shown that children often have difficulty understanding disclaimers:children may interpret the phrase 'when part of a nutritionally balanced breakfast" to mean that the cereal is required as a necessary part of a balanced breakfast.
我不懂的是when part of a nutritionally balanced breakfast.
我怎么觉得这个分句连主谓宾都不全啊