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Artificial light was created by means of electricity.
Literal
Artificial [attributive-な] light [topic-は] electricity [called-という] means [by-によって] was-made-[passive-れた].
Expository prose. ~という is the nominalizer 'called X, referred to as X,' here attaching to 電力 ('electric power') and modifying the following 手段 ('means') — 'a means called electric power.' ~によって ('by means of, through') is a formal agentive/instrumental construction, more formal than で. The passive 作られた ('was made') drops the agent entirely, typical of impersonal/historical statements.