求教OG768：OG解释的疑问

ScarlettDeng

Thelonious Monk, who was a jazz pianist and composer, produced a body of work both rooted in the stride-piano tradition of Willie (The Lion) Smith and Duke Ellington, yet in many ways he stood apart from the mainstream jazz repertory.

(A) Thelonious Monk, who was a jazz pianist and composer, produced a body of work both rooted
(B) Thelonious Monk, the jazz pianist and composer, produced a body of work that was rooted both
(C) Jazz pianist and composer Thelonious Monk, who produced a body of work rooted
(D) Jazz pianist and composer Thelonious Monk produced a body of work that was rooted
(E) Jazz pianist and composer Thelonious Monk produced a body of work rooted both

正确答案是D

针对A和B，OG给出的解释是

(A) The relative clause introduces wordiness and confusion.
(B) The appositive introduces wordiness and unnecessary grammatical complexity.

其实AB错的地方在于both...and...平行的使用；

我的疑问是：不太明白说A的从句造成confusion以及B使句子变得语法上更复杂是什么意思，我觉得读起来还好啊，A到底会造成什么confusion啊？B的同位语又如何使句子变得更复杂了啊？（= =不好意思，纠结的点有点奇怪）