英语长句语义语法问题，请老师指点

Question

【前面分句的语法结构】Birth control was less of a concern as she got older, but she took the pill to help with her heavy, painful periods, and to make the supply last, she tried alternating one month on, one month off.
问题：整个句子我能明白，但不懂的是“of a concern”是什么语法现象？前面的分句作何理解？
【语义和结构】I found out that—I don’t know if it’s because I’m older—but that doesn’t work very well for your body at all.
问题：语法不太明白，语义也理解的模棱两可，翻译不通顺。
【语义不理解】 It’s mostly paid for by the federal government, which contributes $9 for every $1 given by the state.
问题：关于后面的定语从句，我理解为“每一美元里贡献出九美元”，这在常理上是讲不通的，应该怎么理解呢？语法上又作何解释？

原文地址：http://www.thedailybeast.com/newsweek/2012/03/04/planned-parenthood-under-attack-fighting-back-in-texas.html（前五段）

Answer 1

【前面分句的语法结构】
Birth control was less of a concern as she got older, but she took the pill to help with her heavy, painful periods, and to make the supply last, she tried alternating one month on, one month off.
由三个句子组成——
1、Birth control was less of a concern as she got older,
主语：Birth control节育
系表结构was less of a concern 很少（受到专注）——（less of 属于量词）
时间状语从句：as she got older 随着她年龄的增长
2、but she took the pill to help with her heavy, painful periods, and to make the supply last,
主语：she
谓语动词：took 服
宾语：the pill 避孕药
并列宾补：to help with her heavy painful periods and to make the supply last （药）帮她度过沉重的、痛苦的阶段并使得供给量维持下来
（注：to help with：在…方面给予帮助；last 是动词，作make 后宾语 the supply 的补足语）
3、she tried alternating one month on, one month off. 从月初开始，月底结束，她试着交替使用

【语义和结构】
I found out that—I don’t know if it’s because I’m older—but that doesn’t work very well for your body at all.
第一分句：I found out that—I don’t know if it’s because I’m older—
——破折号中间是插入语
第二分句：but that doesn’t work very well for your body at all
参考译文（直译）：我认识到这一点——（这一点就是）我不知道是否是因为我的年龄已经大了——但是这一点对你的身体根本不太适用。
注释：
find out 认识到（经过观察而发现）
work well 适用，执行顺利
not at all 根本不（doesn’t 中含有 not）

【语义不理解】 It’s mostly paid for by the federal government, which contributes $9 for every $1 given by the state.
主句：It’s mostly paid for by the federal government, 这个东西主要有联邦政府负担费用（被动语态，改为主动是the federal government mostly pays for it联邦政府主要负担它的费用）
非限制性定语从句：which contributes $9 for every $1 given by the state. （也就是说）国州政府每提供1美元，联邦政府（指美国政府）就出资9美元。
注释：
关系代词 which 指代前面的the federal government
介词 for 表示比例关系