* Focusing on the irregularity: *Although the pattern seemed regular at first, it quickly became clear that the spacing between the tiles was irregular, creating an unsettling visual effect.*
* Highlighting contrast: *Despite the consistent rhythm of the music, the vocalist's delivery was irregular, adding an unexpected element of surprise.*
* Emphasizing consequence: *Because of the irregular heartbeat, the doctor recommended immediate hospitalization for further testing.*
* Using "irregular" as a noun: *The irregular in her writing style, though initially jarring, ultimately added depth and authenticity to her work.*
* Combining with other modifiers: *The incredibly irregular shape of the ancient artifact suggested it might have been crafted using a unique and unknown technique.*
Remember, a complex sentence includes at least one independent clause (a complete thought) and one dependent clause (a clause that can't stand alone). These clauses are connected by a subordinating conjunction (like *although*, *despite*, *because*, etc.).