Complex sentence: Since 2010, ARPA-E has hosted the Energy Innovation Summit which takes place at the Gaylord Convention Center, near Washington, D.C. The 9th summit is scheduled to be held March 13th through 15th, 2018.
Split into simpler sentences: Since 2010, ARPA-E has hosted the ARPA-E Energy Innovation Summit. The ARPA-E Energy Innovation Summit takes place at Gaylord Convention Center, right outside of Washington, D.C. The 9th summit is scheduled to be held March 13th through 15th, 2018.