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Making a stained-glass window is a process in which intricacy is required.

It involves creating durable glass sheets and staining them, cutting them into desired shapes, and assembling them into prepared designs.

Each step requires expert craftspeople working together.

Though originally used in religious structures, stained-glass windows found their way into a variety of modern buildings, including residential homes.

These little pieces are now recognized worldwide
as an important form of creative art, whose splendor wouldn’t have
been acknowledged without the glass artists’ desire for beauty sparked by a practical need.

Making a stained-glass window is a process in which intricacy is required.

「전치사+관계대명사」인 in which가 쓰인 문장으로, Making a stained-glass window is a process.와 Intricacy is required in it.이 결합되었다.

Though originally used in religious structures, stained-glass windows found their way into a variety of modern buildings, including residential homes.

Though originally used는 접속사가 생략되지 않은 형태의 수동 분사구문으로, originally 앞에 they were가 생략되었다고 볼 수 있다.

These little pieces are now recognized worldwide as an important form of creative art, whose splendor wouldn’t have been acknowledged without the glass artists’ desire for beauty sparked by a practical need.

whose는 계속적 용법의 소유격 관계대명사로 선행사는 an important form of creative art이다. / wouldn’t have been acknowledged는 ‘~ 했을 것이다’의 의미인 「would have p.p.」와 수동태가 결합된 형태로, ‘인정받지 못했을 것이다’의 의미를 나타낸다.