Complex sentence: The Sthalekars consented to keep Laila for a while, but became attached to her to the point they couldn't bring themselves to return her to the orphanage and thus decided to adopt her.
Split into simpler sentences: The Sthalekars consented to keep Laila for a while. However once Laila settled with them, they couldn't bring themselves to drop her back at the orphanage and thus decided to adopt her.