Complementary strands of DNA have opposing matching nucleotides following base pair rules:
A -> T (U in RNA)
G -> C
With these in mind, let us copy your strand of DNA followed by the complementary strand underneath:
Original: A C T G C T A G C T G A C T T A
Complementary: T G A C G A T C G A C T G A A T
This is the sequence for your complementary strand of DNA.