Many women feel additional stress when they must decide what

Many women feel additional stress when they must decide what they feel is best for their families or what is best for their career.
这个句子中decide后面的句子宾语从句,有点看不懂,帮帮忙分析下..
原来 they feel 是插入语...
谢谢你们的回答,那我就选第一个回答的最佳答案吧..

很多妇女在她们必须决定对家庭更好还是对事业更好时,会感受到额外的压力.（似乎是说在事业和家庭中作出抉择）
decide后面的宾语从句中,what they feel is best for their families 和后面的what (they feel )is best for their career是两个并列的成分,都是decide的宾语.what they feel is best for 意思是：她们感觉对...来说是更好的