Furthermore，although it is commonly supposed that social groups have a single leader，research suggests that there are typically two different leader ship roles that are held by different individuals.
(复合句)
而且，尽管一般人认为社会团体只有一位领袖，但是研究表明通常存在由不同个体担任的两个不同的领导角色。
分句1：Furthermore，although it is commonly supposed that social groups have a single leader
分句2：research suggests
分句3：that there are typically two different leader ship roles that are held by different individuals.
1和2并列
2和3嵌套
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