Here are two sentences:

The Standard & Poor 's 500 stock index ended the quarter up 120 points , a gain of 14 percent , the best performance for that broad market benchmark since 1998 .

The Standard and Poor 's 500-stock index , a broad collection of equities representing leading companies , finished its best quarter yesterday since the last three months of 1998 .

yes

Here are two sentences:

After 26 hours of surgery and a year of anticipation , the boys were separated Sunday at Children 's Medical Center of Dallas .

Two-year-old Egyptian twin boys , born with their heads conjoined , have been separated after 26 hours of surgery at the Children 's Medical Centre in Dallas .

yes

Here are two sentences:

To create the condyle , Dr Mao and colleague Adel Alhadlaq used adult stem cells taken from the bone marrow of rats .

He and a colleague created the articular condyle using stem cells taken from the bone marrow of rats .
yes