select '| Operation | Name | Rows | Bytes| Cost | Pstart| Pstop |' as "Plan Table" from dual
union all
select '--------------------------------------------------------------------------------' from dual
union all
select rpad('| '||substr(lpad(' ',1*(level-1))||operation||
decode(options, null,'',' '||options), 1, 27), 28, ' ')||'|'||
rpad(substr(object_name||' ',1, 9), 10, ' ')||'|'||
lpad(decode(cardinality,null,' ',
decode(sign(cardinality-1000), -1, cardinality||' ',
decode(sign(cardinality-1000000), -1, trunc(cardinality/1000)||'K',
decode(sign(cardinality-1000000000), -1, trunc(cardinality/1000000)||'M',
trunc(cardinality/1000000000)||'G')))), 7, ' ') || '|' ||
lpad(decode(bytes,null,' ',
decode(sign(bytes-1024), -1, bytes||' ',
decode(sign(bytes-1048576), -1, trunc(bytes/1024)||'K',
decode(sign(bytes-1073741824), -1, trunc(bytes/1048576)||'M',
trunc(bytes/1073741824)||'G')))), 6, ' ') || '|' ||
lpad(decode(cost,null,' ',
decode(sign(cost-10000000), -1, cost||' ',
decode(sign(cost-1000000000), -1, trunc(cost/1000000)||'M',
trunc(cost/1000000000)||'G'))), 8, ' ') || '|' ||
lpad(decode(partition_start, 'ROW LOCATION', 'ROWID',
decode(partition_start, 'KEY', 'KEY', decode(partition_start,
'KEY(INLIST)', 'KEY(I)', decode(substr(partition_start, 1, 6),
'NUMBER', substr(substr(partition_start, 8, 10), 1,
length(substr(partition_start, 8, 10))-1),
decode(partition_start,null,' ',partition_start)))))||' ', 7, ' ')|| '|' ||
lpad(decode(partition_stop, 'ROW LOCATION', 'ROW L',
decode(partition_stop, 'KEY', 'KEY', decode(partition_stop,
'KEY(INLIST)', 'KEY(I)', decode(substr(partition_stop, 1, 6),
'NUMBER', substr(substr(partition_stop, 8, 10), 1,
length(substr(partition_stop, 8, 10))-1),
decode(partition_stop,null,' ',partition_stop)))))||' ', 7, ' ')||'|' as "Explain plan"
from plan_table
start with id=0 and timestamp = (select max(timestamp) from plan_table
where id=0)
connect by prior id = parent_id
and prior nvl(statement_id, ' ') = nvl(statement_id, ' ')
and prior timestamp <= timestamp
union all
select '--------------------------------------------------------------------------------' from dual
/

Run the above query after a statement is explained.