判断几句英文的结构问题

1 We are taking some of the steps needed to get started,but we need your help to go the rest of the way.
这是一个but 连接的转折句,没有其他从句.
2 However,there are also a lot of people （who prefer to buy a cheap house there anyway 定语从句）.
3 Researchers studying teenagers concluded (that,in that hazardous environment,mobile phones were regarded as "security objects" in parent-teen relationships 宾语从句)-important （because they provided the possibility of contact and communication at all times 状语从句）.
没有其他从句.还有什么方法辨别句子的类型是什么从句吗，讲点各种从句的特点吧，谢啦就是按照定义来。那第一句是并列句子还是复合句呢？复合句必须是有从句和主句作为一句话对么并列句。前后两个部分是并列的。