Complex sentence: Authorities reopened the case in 2013 and requested information from the public; information obtained from those tips led them to Margarita, and DNA comparisons confirmed that she was the mother of Baby Hope--who could now be identified as Angelica Castillo.
Split into simpler sentences: Authorities reopened the case in 2013 and requested information from the public. This information led investigators to Margarita Castillo, and DNA comparisons confirmed that she was the mother of "Baby Hope"--who could now be identified as Angelica Castillo.