Complex sentence: After the heist, "Mrs. W" is deceived into retrieving the disguised "lolly" from the railway station herself, which she successfully manages, but not without serious complications owing to her tendency to righteous meddling.
Split into simpler sentences: After the heist, "Mrs. W" is deceived into retrieving the disguised "lolly" from the railway station herself. This she successfully manages to do, but not without serious complications owing to her tendency to righteous meddling.