Complex sentence: At the end of April 1950, the Triboro decided to shift the bus stop back to the corner, this time due to several accidents with the pillars of the Astoria elevated line.
Split into simpler sentences: At the end of April 1950, the Triboro decided to shift the bus stop back to the corner. The bus stop was moved because it was a safety hazard, as there were several accidents with the pillars of the Astoria elevated line.