第３回の英検準１級の長文の１部です。

Question

第３回の英検準１級の長文の１部です。Yet Higgins remained commited to his belief that the most engaging way to tell a story is through that conversations of its characters, as this compels the reader to pay close attention to what is being said.
この文の主節はどこでしょうか。

Answer 1

that conversations → the conversations

Yet Higgins remained commited to his belief that the most engaging way to tell a story is through the conversations of its characters, as this compels the reader to pay close attention to what is being said.

Yet Higgins remained commited to his belief – main clause

that the most engaging way to tell a story is through the conversations of its characters – subordinate content clause (内容節) [complement to 'belief' and marked by the subordinator 'that' (従位詞)]

as this compels the reader to pay close attention to what is being said – supplementary clause (補足的節) [as indicated by the comma]

Answer 2

the most engaging way to tell a story かと