Please pass this samples on to sb.

前一句可以把 on 提前,加强语气.大致没问题,唯一问题是单复数呵呵.Please pass on these samples to sb.


后一句我没看太懂.可以根据以下情况表达更清楚一点：
这样的样品通常都是以这样的方式给某人的 Such samples are usually delievered to sb.in this way.
给某人的样品都是这样给的 Such samples that are delievered to sb.are usually conducted in this way.