A more practical goal is to try, to the best of your ability, to be as tolerant and composed as you can when faced with trying situations involving your children.

句子主干：A more practical goal is to try.

修饰成分：to be as tolerant and composed as you can作try的宾语;when faced with trying situations时间状语从句;involving your children现在分词短语作后置定语，修饰situations。

翻译：一个更可行的目标是，在面临那些涉及到孩子的难熬情况时，尽你所能地保持宽容和镇定。